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One dungeon I played took 7 in game days because we long rested after every room with enemies.
That's silly, if you're spending an entire day in a dungeon resting and sleeping then monsters should definitely be interrupting you and making it so you can't exploit the rules.
Me as the DM: You wake up from the long rest and discover that almost all of your rations have been eaten by rats.
Roll to see how many fingers and toes have been nibbled.
The Ratfolk player who is now suspiciously ration-shaped:
Rope Trick would allow for a long rest, pretty much anywhere. Level 2 wizard spell, though you would need to be a 9th level caster to use it in such a manner.
Duration is 1h, so your wizard would be burning a second level or higher spell slot every hour for 8 hours. They also wouldn't get the long rest presumably. Sure, you can do it, but it isn't sustainable.
1h per level, at least in 3rd.