it's similar to something like skyrim where there's SO much to do. and with witcher all the side content stuff is so well done that by hour 150 your stamina starts to wear thin... then you realize you haven't even gotten to skellige yet... you need a break, just to recharge... but by the time you recharge you've been away long enough (even if it's only a few days) that the pull to do just one more thing doesn't quite have you anymore. so 6 months down the road you're like... i need to finish that game! so you turn it on and you have NO idea where you are, NO idea what's going on, NO idea how to play anymore... so you start over and the cycle refreshes anew.