1. a request should expire after 2 Hours, if it's in wait ack status for that much time andUnder channel attributes of your remote TP channel, set the Retry Interval as 120 and Retry Count as zero. Your request will remain in MSG_WAIT_ACK status for 120 minutes and then it will error out (if ACK is not received by then)
2. a request should expire after 1 day if the corresponding Response(3A4 Confirmation) doesn't come in 1 day time (1440 mins).Time To Perform is not supported in B2B 11g as of now. Log a SR with support if you need this feature in 11g. As a workaround, you may handle the SLA at back-end.