Have now officiated in six different states and the standard has always been 60 minutes for varsity. For sub-varsity HS games, pretty much 30 minutes is what I always remember being the mark. Of course one is always encouraged to shoot for a little earlier (~45 min) if possible, but work conflicts are understood and frankly if you're pushing 15 minutes from time to time no one cares as long as you keep your partner informed and get the game in.
For MS games, 20-30 minutes.
For weekend youth/AAU games, my personal standard is proportional to the paltry game fees I earn, meaning usually about 5-10 minutes. And even then, if I have the first slot in the morning, sometimes the gym is still locked when I arrive.
