A chum of mine, an old tanker AEO had been on Neptunes as a sergeant siggie. His proud boast was a 3 day trip, taking off at 2345 and landing at 0015 the day after next, a total of 24hrs 30 (2 crews on board). Never actually saw his logbook, mind, so he might have been shooting a line! Did 7 mins on a Victor once - captain need to get airborne for night currency and an approaching cu-nim put him off the idea of extending it to 45 mins circuit bashing as was the norm.