Know what “enough” looks like before you start, or you’ll sprint right past it.

Without a defined finish, effort has no natural stopping point, and the target quietly moves every time you get close. You end up chasing a number nobody ever specified, which is unsatisfiable by design. Deciding the destination in advance is what makes arriving possible, because otherwise there is nothing there to arrive at.

Write down what enough means for the thing you are currently chasing. A figure, a level, a state of life you could describe to someone. Then check it against the hours it costs. Revise it deliberately later if you want, but not by accident every week.