How long did it take you to get your 1st $100 from Adsense? (Please also how many websites). For me, I still haven't reached my 1st $100 I'm at around $85 (signed up adsense in end of June).
My first $100 check actually wasn't from Adsense it was from Bidvertiser and that took me 4 months to reach that. Now I make $100 a month easy.
Took almost 3 months to make first $100. My suggestion is to focus on contents and use Adsense smart way.
Low PR, low AdSense earnings. PR 3 and up, you can make good money. I had PR 3 but lost it in last update. Hoping for a raise this time...