Sorry I know its been a minute, but if you're still wondering it's about standard for a tabletop RPG, which is to say it sort of shines at 1 GM and 3-4 players, but you could do more (beyond 5 players could be unwieldy and you'll start duplicating roles,) or less (1 or 2 players will pull some of the sense of collaboration out of the game and you may need to scale your adversaries differently, or have them play multiple characters each) with some minor tweaking.