My bootlegs are showing:
Mar 27, 1975 > 3:42:09
Jun 27, 1977 > 3:39:29
Mar 21, 1975 > 3:38:34
Jun 25, 1977 > 3:28:58
May 25, 1975 > 3:54:20 !!!!!
May 24, 1975 > 3:38:02
May 23, 1975 > 3:31:46
Jul 17, 1977 > 3:29:35
Jun 23, 1977 > 3:30:05
Ok I guess it depends when you want to count when the show starts and ends, I'm just going off the tracks in the bootlegs.