Option to visit website once/twice/etc. per time period

[snake144]

I often struggle with checking my Mails and my Social Media (web versions) continously during the day and I would like to limit that to doing that just once or maybe twice. Ideally, I would like to be able to enter that I can visit certain websites just once/twice a day. When I visit these websites, I don't want to have a time limit so that I can basically be on these websites as long as I want to to answer mails and stuff without time pressure.