There's no real "average". It depends on the skill level of the person giving the simul, those playing in it, how much time the players have, the amount of analysis the players expect from the simul-giver after the game, etc.
THE AVERAGE SIMUL

There's no real "average". It depends on the skill level of the person giving the simul, those playing in it, how much time the players have, the amount of analysis the players expect from the simul-giver after the game, etc.
the skill level of the simul giver is D-class rated (1200-1399 USCF) those playing in it are J- E class (UNR-1199) of course I'll raise the level of the player's when I get better through rating . 50min time control and no analysis afterwards.

1.) How's the time control thing going to work? I never played a simul with a time control - whenever the big guy comes to your desk you play your move.
2.) For 1200-1400 player, over 5 players might be too much if you aim for quality games.

1.) How's the time control thing going to work? I never played a simul with a time control - whenever the big guy comes to your desk you play your move.
2.) For 1200-1400 player, over 5 players might be too much if you aim for quality games.
there is no time control for 2000+ but for novice's and lower giving the simlul you set up clocks at each table and pause it everytime he's/she's at another table.

I once played a simul against 24 opponents, took about 2 hours but it was not a clocked simul.
End result:
Schachgeek 24 wins, 0 losses, 0 draws.
Note: these were middle school kids who were taking a chess class, no USCF masters in the bunch. I would estimate their strength at 1100-1200, except for one who was playing about 1500. Later, I learned he was the son of a player I'd always had trouble with 30 years earlier.
Do you have trouble with him now.
What is the average number of people to have in a chess simul like not to much so you can focus and not to low amount of people so you can still have a good challenge.