How long does it take for the USCIS to make decision. I filed B2 extension on Dec 1, got reciept on DEC 7 and havent heard from them yet. My parents I-94 expires on Feb 6. They have return ticket on Feb 1. Is it okay to stay until the decision come and leave within 30 days if rejected. Are you guys sure that if the extension is rejected the visa becomes void even if they leave on time. Need help guys!!