Welcome to the forum, Vicaris. =]
It varies from person to person, but it didn’t take too long for me. I joined April 24th, and had my first induced on May 2nd. Technically it was a little before that, but it was low-level, embarrassing, and I never counted it as a real one. Some people take a really long time with it though, so the trick is to keep practising until you get better. 
Next chance you get feel free to introduce yourself in The Big “Hi, I’m New Here!” Topic - Part XXVII. 