My wife is on H4 which is valid till March 2014. Currently she is in USA. A highly reputed company will be applying for her H1B on April 2013. However, before she does that I would like to clarify a few points: 1. If it is put on premium processing then how long does it usually take to complete the conversion. 2. Lets say the approval is complete within a month i.e. May 2013. By when can she start working? Can she start working [b]immediately[/b]? Or does she need to wait until October 2013 to start working. I am under the impression that she really can start working immediately, but only needs to get her H1B stamped within a year or if she leaves the country. Is that true?