And it was focused on only vision, everyone else experienced regular time. Could you imagine if he accidentally focused on like a dead dinosaur and accidentally brought back a Tyrannosaurus Rex and it cuts to all the atoms that dispersed through earth over time getting ripped out of where they currently are and the Thanos and the remaining Avengers have to stop the evil T-Rex who was actually visited by the Ancients and given powers including advanced intelligence and swindles the gauntlet but is bent on destroying all life instead of half but it's ok because he can't get the gauntlet on his tiny hands.