I'm a novice still (~1500), but at this level you can easily come back from a lost game. Opponents sometimes think that I'm stalling, but in reality I'm trying to make the best out of a lost position. My opinion is that if you go into a game with a certain time limit, the players have full right to use that time how they please. If you are in a hurry, play a different time limit.
If a player has 60 minutes for all their moves, then spend less then a minute for each move, until they are so far behind that in your mind, the game is over, now, they are spending 20 minutes on one move. And I have to still sit in front of the computer, because if I leave, they might make a move just before their timer runs out, hoping that I have already left the room, and now I will lose because it's my timer that runs out.
Eg if someone mouse slips and blinders their queen on their 5th move in a 90 minute game. You have no concern with having to sit there for 1.5 hours where your opponent makes no further moves?