enhancement: Repeat limited by time, "run for hh:mm:ss" or "until hh:mm:ss"

[IntoCpp]

I have a rarely occurring "long delay" issue when using a resource via network. It usually happens in the 8-15 hours range but sometimes never. It usually recover after a few minutes (of a transactions that takes less than a second). I wish I could loop my tests all night, but be certain it stops in the morning to free the resources. If I do a "CTRL-C" I miss the final report.

• Using the repeat I have to guesstimate how many loops I will need for H hours and hope the error will occur at least once in the time-frame. Using the 'run-untill-failure' is not great either since the problem may not occur at all. And I want the test loop to continue to get statistics on recovery time.

Not a big priority, but a nice to have. Thanks for the great work.