There is no limit or any deadline in Google Adsense to earn minimum or maximum. Just put your own efforts which will turn in to money in future days. There are lot of people in world who are running their house with more than 10000$ permonth only from their websites. Dont look at short term money, go slow and be all time performer. One can win with this way.
Dont be upset or confuse if you dont get good money in earlier time. Just keep going and consistency contributors always win like Sachin Tendulkar.
Wish you all the best and I hope, you will make 100$ very soon from the Regional websites and IndiaStudyChannel.com