How much time should you need to get better?

How much time is needed to get better at this game? because i buy it recently and i want to kown it.

all depends on whether you have time and/or previous fps/moba experience
getting good will be faster if you have these two things, if you're in it to play casually or as your first fps... you won't really get good unless you put in the effort, and all depends on the time you have anyway