diff --git a/src/main/lrsql/admin/interceptors/account.clj b/src/main/lrsql/admin/interceptors/account.clj
index 7a61ed59..7c7f4da7 100644
--- a/src/main/lrsql/admin/interceptors/account.clj
+++ b/src/main/lrsql/admin/interceptors/account.clj
@@ -254,7 +254,7 @@
 
 (defn generate-jwt
   "Upon account login, generate a new JSON web token."
-  [secret exp]
+  [secret exp leeway]
   (interceptor
    {:name ::generate-jwt
     :enter
@@ -264,7 +264,7 @@
             ctx
             json-web-token
             (admin-u/account-id->jwt account-id secret exp)]
-        (adp/-purge-blocklist lrs) ; Update blocklist upon login
+        (adp/-purge-blocklist lrs leeway) ; Update blocklist upon login
         (assoc ctx
                :response
                {:status 200
@@ -277,7 +277,7 @@
 (defn block-admin-jwt
   "Add the current JWT to the blocklist. Return an error if we are in
    no-val mode."
-  [exp no-val?]
+  [exp leeway no-val?]
   (interceptor
    {:name ::add-jwt-to-blocklist
     :enter
@@ -286,7 +286,7 @@
         (let [{lrs :com.yetanalytics/lrs
                {:keys [jwt account-id]} :lrsql.admin.interceptors.jwt/data}
               ctx]
-          (adp/-purge-blocklist lrs) ; Update blocklist upon logout
+          (adp/-purge-blocklist lrs leeway) ; Update blocklist upon logout
           (let [result (adp/-block-jwt lrs jwt exp)]
             (if-not (contains? result :error)
               (assoc (chain/terminate ctx)
diff --git a/src/main/lrsql/admin/protocol.clj b/src/main/lrsql/admin/protocol.clj
index e4ed12ae..dc6e52bd 100644
--- a/src/main/lrsql/admin/protocol.clj
+++ b/src/main/lrsql/admin/protocol.clj
@@ -19,7 +19,7 @@
     "Update the password for an admin account given old and new passwords."))
 
 (defprotocol AdminJWTManager
-  (-purge-blocklist [this]
+  (-purge-blocklist [this leeway]
     "Purge the blocklist of any JWTs that have expired since they were added.")
   (-block-jwt [this jwt expiration]
     "Block `jwt` and apply an associated `expiration` number of seconds. Returns an error if `jwt` is already in the blocklist.")
diff --git a/src/main/lrsql/admin/routes.clj b/src/main/lrsql/admin/routes.clj
index cdd976a5..5ede19ba 100644
--- a/src/main/lrsql/admin/routes.clj
+++ b/src/main/lrsql/admin/routes.clj
@@ -40,7 +40,8 @@
                                          (ai/validate-params
                                           :strict? false)
                                          ai/authenticate-admin
-                                         (ai/generate-jwt jwt-secret jwt-exp))
+                                         (ai/generate-jwt
+                                          jwt-secret jwt-exp jwt-leeway))
       :route-name :lrsql.admin.account/login]
      {:description "Log into an existing account"
       :requestBody (g/request (gs/o {:username :t#string
@@ -57,7 +58,8 @@
                                           (ji/validate-jwt
                                            jwt-secret jwt-leeway no-val-opts)
                                           ji/validate-jwt-account
-                                          (ai/block-admin-jwt jwt-exp no-val?))
+                                          (ai/block-admin-jwt
+                                           jwt-exp jwt-leeway no-val?))
       :route-name :lrsql.admin.account/logout]
      {:description "Log out of this account"
       :operationId :logout
diff --git a/src/main/lrsql/input/admin/jwt.clj b/src/main/lrsql/input/admin/jwt.clj
index f829f581..63d3f7bd 100644
--- a/src/main/lrsql/input/admin/jwt.clj
+++ b/src/main/lrsql/input/admin/jwt.clj
@@ -9,6 +9,14 @@
   (-> (u/current-time)
       (u/offset-time exp :seconds)))
 
+(defn- current-time
+  "Generate the current time, offset by `leeway` number of seconds earlier.
+   
+   See: `buddy.sign.jwt/validate-claims`"
+  [leeway]
+  (-> (u/current-time)
+      (u/offset-time (* -1 leeway) :seconds)))
+
 (s/fdef query-blocked-jwt-input
   :args (s/cat :jwt ::jwts/jwt)
   :ret jwts/query-blocked-jwt-input-spec)
@@ -28,9 +36,9 @@
    :eviction-time (eviction-time exp)})
 
 (s/fdef purge-blocklist-input
-  :args (s/cat)
+  :args (s/cat :leeway ::jwts/leeway)
   :ret jwts/purge-blocklist-input-spec)
 
 (defn purge-blocklist-input
-  []
-  {:current-time (u/current-time)})
+  [leeway]
+  {:current-time (current-time leeway)})
diff --git a/src/main/lrsql/spec/admin/jwt.clj b/src/main/lrsql/spec/admin/jwt.clj
index e9fc5f72..c402d3d4 100644
--- a/src/main/lrsql/spec/admin/jwt.clj
+++ b/src/main/lrsql/spec/admin/jwt.clj
@@ -18,6 +18,7 @@
 
 (s/def ::jwt string?)
 (s/def ::exp ::config/jwt-exp-time)
+(s/def ::leeway ::config/jwt-exp-leeway)
 (s/def ::eviction-time c/instant-spec)
 (s/def ::current-time c/instant-spec)
 
diff --git a/src/main/lrsql/system/lrs.clj b/src/main/lrsql/system/lrs.clj
index 665ca78b..cb12aca5 100644
--- a/src/main/lrsql/system/lrs.clj
+++ b/src/main/lrsql/system/lrs.clj
@@ -308,9 +308,9 @@
   
   adp/AdminJWTManager
   (-purge-blocklist
-   [this]
-   (let [conn (lrs-conn this)
-         input (admin-jwt-input/purge-blocklist-input)]
+   [this leeway]
+   (let [conn  (lrs-conn this)
+         input (admin-jwt-input/purge-blocklist-input leeway)]
      (jdbc/with-transaction [tx conn]
        (admin-cmd/purge-blocklist! backend tx input))))
   (-block-jwt
diff --git a/src/test/lrsql/admin/protocol_test.clj b/src/test/lrsql/admin/protocol_test.clj
index d6acb9bf..bd4f460f 100644
--- a/src/test/lrsql/admin/protocol_test.clj
+++ b/src/test/lrsql/admin/protocol_test.clj
@@ -127,33 +127,36 @@
         (let [bad-account-id #uuid "00000000-0000-4000-8000-000000000000"]
           (is (not (adp/-existing-account? lrs bad-account-id)))))
       (testing "Admin JWTs"
-        (let [expiration 2
-              jwt-1      "Foo"
-              jwt-2      "Bar"]
+        (let [exp    2
+              leeway 1
+              jwt    "Foo"]
           (testing "- are unblocked by default"
             (is (false?
-                 (adp/-jwt-blocked? lrs jwt-1)))
-            (is (false?
-                 (adp/-jwt-blocked? lrs jwt-2))))
+                 (adp/-jwt-blocked? lrs jwt))))
           (testing "- can be blocked"
-            (is (= jwt-1
-                   (:result (adp/-block-jwt lrs jwt-1 expiration))))
-            (Thread/sleep 2000)
-            (is (= jwt-2
-                   (:result (adp/-block-jwt lrs jwt-2 expiration))))
+            (is (= jwt
+                   (:result (adp/-block-jwt lrs jwt exp))))
             (is (true?
-                 (adp/-jwt-blocked? lrs jwt-1)))
+                 (adp/-jwt-blocked? lrs jwt))))
+          (testing "- cannot insert duplicates into blocklist"
+            (is (some? (:error (adp/-block-jwt lrs jwt exp)))))
+          (testing "- cannot be purged from blocklist if not expired"
+            (is (= nil
+                   (adp/-purge-blocklist lrs leeway)))
             (is (true?
-                 (adp/-jwt-blocked? lrs jwt-2))))
-          (testing "- can be purged from blocklist only when expired"
+                 (adp/-jwt-blocked? lrs jwt))))
+          (testing "- not counted as expired in blocklist due to leeway"
+            (Thread/sleep 2000)
             (is (= nil
-                   (adp/-purge-blocklist lrs)))
-            (is (false?
-                 (adp/-jwt-blocked? lrs jwt-1)))
+                   (adp/-purge-blocklist lrs leeway)))
             (is (true?
-                 (adp/-jwt-blocked? lrs jwt-2))))
-          (testing "- cannot insert duplicates into blocklist"
-            (is (some? (:error (adp/-block-jwt lrs jwt-2 expiration)))))))
+                 (adp/-jwt-blocked? lrs jwt))))
+          (testing "- can be purged from blocklist when expired"
+            (Thread/sleep 1000)
+            (is (= nil
+                   (adp/-purge-blocklist lrs leeway)))
+            (is (false?
+                 (adp/-jwt-blocked? lrs jwt))))))
       (testing "Admin password update"
         (let [account-id   (-> (adp/-authenticate-account lrs
                                                           test-username