From my log book the longest unrefueled sorties are 1 hour 25 minutes doing subsonic PIs and 50 minutes doing super sonics or high flyers (Mk 6). I also have 2 hours 5 minutes with overburgers where I was spare for the Squadron push to Muharraq. This was one of the first Lightning dets to the east, and I followed both pairs to Paris - sadly for me all 4 managed to plug in and I ended back at Binbrook,