I know one new hire Tornado/Challenger german Airforce on Large cabin also in the 3000 H which have been recommanded for upgrade by LT, Netjets answer was that he was seat lock FO for 24 months...so we have to be carefull when we said yes no problem...also everybody knows that Netjets is overcrew by around 100 Pilots right now and still hiring to compensated the guys leaving at higher rate than expected and the French going to AF ...so to be safe think about 18 months from date of first salary before upgrade it may happen earlier but also later.. if the FO salary is not a problem its a different game.