6 or 8 months. Don't remember exactly. I started off a site and didn't plan to monetize is but did monetize it without optimizing it.
I have been serving ads for 6 months, no single payout yet. But it's now starting to accelerate to $1.++ per day. ;D
I've been with them about 2 or 3 months, I haven't been doing any promoting or optimizing, and I think I've generated about $10. I only put them on there to kill some white space, maybe I should get serious about AdSense....
i have been doing for 6 months , still not have touched 100 mark .....hope soon will touch it.........
spam it up mahn , spam orkut to get indian traffic , spam myspace 4 outside traffic. when ever there is a vuln comes out , i make sure i exploit it , hacked over 1000 acc using cookies scraped over 50000 people , own countless n.o of giant communites .............all this 4 to get 10 $/day .........
6 months with a real site. Otherwise I've had adsense with crappy sites for like 2 years and nothing.
The first day I added adsense, my site made over $16, but then it gradually leveled at about $6/day. I still get $20-$30 days, but only when they run lots of flash, rather than text ads. You should play around with the ad positioning, color schemes, and page contents - it really makes a difference. Good luck!