Re: boxing gym question
Depends on the gym you go to and how fast you pick up the fundamentals and etc.
For my gym when I first started training there, only things I learned in first few weeks were pretty much all fundamentals.
I learned stuff like jab, foot work, blocking, head movement, then we would combine them all later to do some drills with it. After I've learned the most of the fundamentals which was about a month, my coach let me spar for first time.