I believe the issue is with the Old Rules Engine. I and others are testing the new Rules engine and those issues have gone away. I have had Rules setup to turn lights off at a certain time and the turn them on when a motion trigger is sensed. I had these setup to start at 10pm. However, they never started at 10. I would see up to 5+ minutes delay in the the lights going off and the trigger to become functional. I ended up moving the time back by a few minutes and the Motion trigger ahead by a minute and everything fires as expected.
Now that I am testing the new rules engine, the first thing I tested was the motion trigger and lights off times. It all worked at 10pm like requested.
@Bam is correct in his assumption and corrections, I too will be looking forward to see how @kirnkorner2001 test goes.
Here is a link to my tests that I performed when on the old rules engine: Scheduled Rules