In theory, an H1B who is let go has 24 hours to leave the country. The 30-day grace period is a myth. It is just a "de-facto" grace period since to file a new

In theory, an H1B who is let go has 24 hours to leave the country. The 30-day grace period is a myth. It is just a "de-facto" grace period since to file a new petition one needs their last pay statement (and if the pay statement is older than 30 days the USCIS will know that one is no longer working there).