I would've thought something in the 5yrs $125-150mil range for Bane.
Probably closer to the $30mil per year than $25mil. He is a top 10 SG. Lot of those 11-17th rank starters are getting $18-23mil. So let's go with the $150/5yrs marker.
Heck, Bane is better than Jerami Grant ($32mil per) or Kyle Kuzma ($26mil per).