What is the last raid you lost and ran out of time to redeem the defeat?
Started a Jynx with less than 5 minutes on clock. Didn't know the moves (obviously), fainted a bit before the end, had enough time to rejoin. However, wasted a few seconds switching bc first on recommended 2nd team was 2711cp dt/SE Aggron. Confusion/Avalanche messed my Moltreses up. I have a max Mewtwo but it has confusion, so I picked the PC one. What have you narrowly missed and could have used some more time to adjust?

Answers
If you had more and more chances would your team have been your best team? I obviously should have put something else in there to tank bc the boss gains substantial health after you rejoin. Instead of 1 or both Moltres, another 2500 Flareon, 2550 Arcanine, 3411 B/C Tyranitar, another level 30 PC/ShB Mewtwo, fast TM my max ShB Mewtwo?*** A level 38.5 HP Kyogre would have lasted long enough as a tank anchor
Today, Lugia (HP), six of us plus some newb kid in a nearby house. We were all hitting with Kyogres, Mewtwo, Dragonites, and didn't have quite enough punch to take it down, despite two tries. But we did get a good laugh at what the anonymous kid was fighting with.
Maybe we should have just went with T-Tars and taken the damage.