Reminds me of when it was smelly as hell in our house a few years ago and when we checked just by chance the roller shutter of one of the windows, we found a dead bird in there which probably got stuck there and was crushed to death.
Good thing is that the smell does fully go away even if you don't get to it. My house had a problem with mice in the attic and walls, but there was no patching fix that could reasonably done, since this is an old and pretty drafty house. They can really slip through the smallest cracks, even underground, and there had to be a hundred of cracks like that. Putting up and swapping snap traps was a pretty onerous task that never seemed to fully work.
The pest control crew that did fix the problem did so by putting a bunch of slow-acting poison bait traps around the property and in the attic. 3 days later some seriously awful smells popped up throughout the house, but they went away after a little over a week. Those mice are part of the building now, but I've completely forgotten about them.
Depends. I've had a dead mouse smell for two months before it stopped.
Even since then, I've noticed it in other places. Like I was in a fancy restaurant one time and they had a covered patio where I recognised the smell. Totally ruined my meal.
Ah yes, sorry I should have provided context but thought German readers would recognize it and other would ignore it.
This was a German reddit meme where a guy had mice in his apartment in Berlin. An exterminator just poisoned a lot of them and told him the smell would be gone in 2 or 3 days.
He was describing the smell in very colorful words.
"Da ist nicht viel dran" trended on r/de for a year or so.
My parents had a rat decomposing in a glue trap for weeks and were complaining about the smell because they forgot there was a glue trap in the room where the rat was killed.
Please don't use glue traps, by the way. They're incredibly cruel.