Animalclub
3 hours plus seems a little over what is allowed for ETOPS isn't it?
Remember the whole ethos behind ETOPS (or EROPS) is that of
pre-planning.
Thus before take-off, suitable diversion airfields are nominated, alternate minima are "stepped up" etc etc. In the same way the aircraft is certified for 120/180mins diversion but on the day you have to fly to your nearest airport regardless of how long it takes. You can't "clock off" at exactly 180 mins into your diversion if that leaves you a few miles short!