Hi can you tell me How much time google take time for approved a adsense account . and What is the main rule which Google has never said anyone.
It can take days or weeks, depending on the experiences of members here. The main rule Google has never said to anyone, we are still waiting for them to say.
It can take some where from few hours to weeks, you can read Google adsense official support article for more info here: support.google.com/adsense/bin/answer.py?hl=en&answer=76228