It's hard to say, really. Taking protein supplements will increase the process, but it can still take a long time. Just make sure that if you actually are working out 5-6 days a week that you vary what you exercise every day (ie, legs one day, chest & back the next, arms and stomach the day after, etc etc blah blah) so that your muscles have time to heal.
You'll probably notice a small difference after a month, then maybe around 3 months, six months, and a year. It's really something that you have to work at for it to happen.
I'm sure others will have more to say, but thats the gist of it.
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