For short periods of time, prescription medications (such as narcotic pain medications or muscle relaxants) may be helpful to alleviate pain or related complications.
It can take anywhere from 4-10 hrs. now if your head gasket is warped you will have to take it to have it milled that takes from 1 day to several days. if not you can just buy a completely new one that fits perfectly for about $150.
Labor - Flush The Honda Pilot Transmission. Drain and dispose of existing transmission fluid. Remove transmission pan, filter and existing gasket. Install new filter and reattach pan with new gasket. Fill with fresh transmission fluid; verify proper level and leak free operation. 1.6 hours.