Why it does not happend using progressive?
If I render an animation I need the exact same number of passes for every frame, but all the frames are not completed in the same time, so... why is using progressive so awesome?
I never limit render by time, never! I need/want a quality, and that quality is a number of samples, or an specific amount of refinement with bucket mode.
Using the time limit is useful when you have to do some render test and you know you are going to be out of the office for X time, or you want to take a break of 10 minutes, you put a 10 minutes render and when it finishes... you know your break has finished hahaha
Cheers.