back at british midland AW years ago in the 70's amd 80's we often turned the a/c around in 30 minutes (scheduled) or less, was not a big issue for anyone
back then...no one threw their toys or got sweaty ...
viscounts dc-9
707 was abit longer admittedly...
had a dc-9 one evening we did in 5 mins...85 pax off and 85 on...
splash of fuel hardly any bags load sheet ta ta pushback, feet up coffee and a meal off the inbound