I’m guessing the overall show lengths are longer now so if you go by “in-ring time as % of show length,” this changes a bit.
DC MatthewsThe 10 Summer Slam's with the shortest amount of in-ring time. (no dark matches, rough calculations) '25, Night 1 (1 hour, 20 minutes) '26, Night 2 (1:22) '88 (First ever) (1:24) '26, Night 1 (1:25) '90 (1:28) '91 (1:30) '07 (1:34) '25, Night 2 (1:34) '89 (1:35) '96 (1:35)