It was last year, and that site of mine was getting around 50-100/UV a day. Took me 1.5 month for the first check.
Addsense earning not only depend on the traffic but also the CTR and CPC. if your website is high pay niche with good CTR, maybe CPC=$3 and CTR=10%, then 15UV per day can bring you $100 in a month. However, if you are in low pay niche and bad CTR (assume CPC=$0.02, CTR=$0.2%), then you need 80000UV per day to achieve $100 in one month
it took a lot of visits - i guess its 20000 visits bcoz that is a celebrity site and i never realized how bad they convert.
Any beginner to adsense would have struggled a lot to reach the $100 target and it took months for me to reach the first milestone with five thousand UV...
took me like 4 months to get my first check...erm...visitor....i think around 200uv...it was way back