Matte is correct, 2-4 weeks is pretty standard. But there are many factors…
If you’re editing together 3 cameras it should take more time than if it’s just 1 camera.
There’s a big difference between 25 copies and 500 copies.
I’ve shot shows that are 45 minutes and shows that are 3.5 hours (if they want 2 performances done.)
So while I’d say 2-4 weeks is “average” I would also say that 1-8 weeks are all possible too, depending on the answers to these questions.
But you know, none of this really matters. The real answer is “whatever you told them before the shoot.” And that’s the most important thing. Give them a time estimate before (or shortly after) the shoot and stick to it. Telling them “3 months” and meeting that is actually better than telling them “3 days” and then coming in at 2 weeks. Make sure they know what to expect (and that they’re happy with that number) and you’ll be fine.