[omarfarooq]

You should stop once your aspiration to continue is eclipsed by burnout. In other words, you've reached your final plateau, and are so stifled that you must descend.

Note that I am not saying that burnout alone should be cause for quits, far from it, but that you've reached a level of burnout where you are not assimilating what you've learned up to the point of that burnout to help you move past it.

Burnout is always telling us something, that there needs to be some change in our processes.