Comment by crazygringo

If you plan in advance that something will take a particular amount of effort, then you're not going to feel frustrated as long as it's within that amount of effort. You've already decided that the cost-benefit analysis is worth the cost.

You start feeling frustrated when it takes longer than what you've planned for. When it's not going according to plan. And you need to step back and say, OK now is it still worth it...?

Some things just can't be powered through. Frustration helps us realize that so that we don't waste more energy on things that don't seem accomplishable.