My LIB VISA and I94 will expire on 30 March 2013 . My employer has filed L1 B extension and I got REF on that . I am not confident that L1 B extension will be approved therefore after I file REF response i am planning to go for COS to H4 so that I don't go out of status and then from H4 I can go ahead and file H1 . I want to know how much time it takes for COS to H4 from L1B as i want to work maximum number of days before I go for H4 . Also is is possible that I e - file H4 application work till I get verdict on my L1 B extension and after that only submit documents required for H4 . in case L1 gets rejected I will not be out of status as I have already files H4 application and if L1 gets approved I can withdraw H4 application .