Disregarding the dumb RNG of the game and using SCIENCE:

(Hippie code): Max allowed traitors: 4

Wondering how many times you'll roll traitor on a server with always 40 people on, rounds ALWAYS lasting an hour and Hip code? (This is disregarding other gamemodes)

One hour: 10% chance

One day (the whole deal. I know some people that packs up red bulls to go on a gaming binge): 2.4 times, or 2 if we truncate. 3 if you're lucky.

One month made up of 30 days: 72 traitor rolls