I know this is much more abstract, since it heavily depends on the situation, but there are a lot of considerations when, during the game, you have that choice. Plus, this intertwines a lot with others concepts, like crowding, momentum, board control, pushes, etc. It'd be a good "conclusion" to your minutes.
And well, if they are too long, you might as well split them in parts. That'll give you more minutes while they last, since you're eventually going to run out of subjects :P