I choose the quickest car of each manufacturer for this chart and it seems that all were able to do 14 laps per stint, only Corvette had to switch between 13 and 14 laps, while Porsche clearly shows their fuel cell trouble.
Ferrari_51 | Ferrari_52 | Ferrari_71 | Chevrolet_73 | Chevrolet_74 | Porsche_79 | Porsche_91 | Porsche_92 | AstonMartin_97 | |
Pitstops | 27 | 15 | 2 | 26 | 27 | 25 | 25 | 28 | 26 |
Avg | 12,6 | 9,4 | 14,5 | 13,0 | 12,4 | 12,8 | 12,4 | 12,1 | 12,0 |
Pittime | 00:35:25,419 | 05:08:10,620 | 00:04:55,033 | 00:41:00,681 | 01:13:09,409 | 00:53:37,367 | 02:30:42,135 | 00:37:40,871 | 02:33:36,029 |
min | 00:00:52,321 | 00:01:03,931 | 00:00:57,987 | 00:01:01,450 | 00:01:00,345 | 00:01:12,386 | 00:00:53,843 | 00:00:46,227 | 00:01:02,221 |
max | 00:03:37,238 | 02:29:32,216 | 00:03:57,046 | 00:05:05,291 | 00:25:56,731 | 00:08:02,385 | 01:06:03,529 | 00:03:03,357 | 00:51:26,128 |