My spouse was on F1 visa and went to Canada US embassy to change from F1 to H4 but they said they need to additional administrative process and they will email him in 30-60 days and if he can follow up with them after 60 days. They gave back all his documents to him. Its been 3 months already they haven't emailed us yet. Does anybody know how long does this administrative process take? Since he wants to come on H4, can he reapprear for visa interview again instead of waiting for this case status? Please advice.