I suspect boredom to be another thing that can result in willpower depletion: it’s hard to stay engaged in something when it’s boring. It may be possible on less difficult tasks to keep going longer, but it eventually begins to drain on you (although maybe this is covered by wanting to do some other specific thing, but I suspect it was distinct in that you can be bored without having something you would rather be doing).
I suspect boredom to be another thing that can result in willpower depletion: it’s hard to stay engaged in something when it’s boring. It may be possible on less difficult tasks to keep going longer, but it eventually begins to drain on you (although maybe this is covered by wanting to do some other specific thing, but I suspect it was distinct in that you can be bored without having something you would rather be doing).