If you are thinking, how fast can a person build muscles? Well it actually depends, how much muscles you have in mind but definitely you can build a impressive amount in as much as one to two months, but if you keep on working hard it's just a matter of time before results will be obvious.
Speed of muscle growth with proper training and diet can be amazing, especially if you work hard at your workouts you can easily build muscles in no time.
It's only too often that people start with a lot of desire and quit after a week or two, which is a shame really, after a week you don't even get used to your new workout and your diet and let alone seeing any results.
The real deal comes after a month or two of hard working, since this is the appropriate time for results to start showing up and you will be amazed at how much you can achieve in such a short time.
But remember a few tips if you like so many others come to that point where you don't see a point in all this anymore, at that time remember what for you are doing all this, why did you start in the beginning and how will you look like when you are done with your plan.
This should keep you going when or if it get though.
The exercises you need to focus on at the gym are compound exercises like deadlift and such, all the anaerobic exercises will do also.
So remember, keep your chin up, don't give up, workout with compound exercises, have your goals visualized and don't stop.
With all this in mind results will come shortly.