get runtime under controle

[Eh2406]

According to the logs:
in run497 (8170c96) time per iteration was 873.65 s - 1063.40 s taking abort 7 h all toled.
in run498 (1f5ca2e) time per iteration was 887.42 s - 1234.78 s taking abort 8 h all toled.
in run499 (568d10e) the logs where lost.
in run500 (2903ac0) time per iteration was 1573.58 s - 1681.25 s taking abort 12 h all toled.
run501 was canceled because it was taking to long.
run502 has bean running for 12 h already and is not quite done.

We can work with 12 h, now that we know, but we cant go much longer and still do overnight runs.