Not too long - I can't give an exact estimate, my sense of time is till recovering from anything less than a decade being a meaningless flash.

[He's two thousand years old, do you really expect him to be good at keeping track of minutes? That's why he set up a timer in the first place.

He serves up a heap of the cheesy potatos without pepper flakes and sets it where Prompto can grab it before dishing up for himself.]

It's not too terribly difficult, though. One of the things that's easy to modify based on what you like. Ham, tomatoes, a bit of green onion...