To be fair, you should also subtract the time it will take you to learn the skills that will end up saving you that time. As long as it's less than 365 minutes it should pay off for you in less than a year.

To add to this, I think the hidden value of workflow optimization is avoiding interruptions.

If the optimization itself is only worth a few seconds but it allows me to remain focused on whatever I'm actually working on, it becomes much more valuable.