Ok so maybe i am splitting hair here but I really want to figure out the best way to go about this.

When you build a mini-camp it takes 20 days to generate young players down from 24. Every time you upgrade the clock resets, correct? But the clock doesn't start until the camp has been built. So if it takes 3 days to upgrade the facility, the best time to start the upgrade is 3 days prior to the arrival of the young players, correct?