That was at least 9+ hours. I added a Tranquility topliner contour (super plus - 32" x 14") booster with my usual diaper, plastic pants and compression shorts under clothes with my sport jacket. It was close from leaking but it worked. I didn't bring my emergency diaper. By the evening I was afraid that my diaper was going to be noticed (soaked). That 9+ hours was the limit for me. We had a bottle of wine for dinner and I had a few drinks of wine at CSO (she limited drinking - she drove). When I talked on the phone she wondered how I went without changing the whole night. Now she knows how I did it. Tonight I won't use the booster and try to change when I have to. She knows. There really isn't a reason to not change for the evening. I'm still a littler nervous but she hasn't freaked out. Here we go...