Started driving after 2.5 years. Would have been much, much sooner if I had been 21. Was qualified to drive before I was 21 and was actually on the street driving 2 weeks after my birthday. That was 18 years ago.
Took me 7.5 years to become FT. I could have gone FT a lot sooner as well but I was already top rate and didn't want to bid lesser wage FT jobs just to get FT. Big mistake on my part since most of the others that bid FT air bids or combos were back to FT driving bids within months. I'd probably have another 3+ years FT if I had done that. And also quite a few spots higher in the seniority list.