90-120 days. It really depends on the air frame. AFRC will give you 3 years of seasoning orders in the Raptor, but you'll only get about 6 months worth of orders in the Hog. Viper is even less.
Depends on the unit and your ability in the jet. Most units won't be in a rush to upgrade you right away, especially not if you're going from a lead nose aircraft to a radar equipped aircraft.
Again, it depends on the unit. If RPA is available, yes, they will put you on orders. If we're on Continuing Resolution 69 and RPA is gone, then no. If you're a TR that has already used your TPs, UTAs, and AT, then there is no other option.