thank you for your answer.
My visa is valid for about 5 years.
The only thing is I want to be independent to my employer, with EAD there isn't as much power on this side in special at salery negoations in the future.
An other point is, I have to leave the country in about 1 or 2 weeks in the case I get fired. The job sounds good but you never know what will happen at this times. (in special political and economical)
But 60 days I think is ok. The first time there will be enough stress to seddle down over there.