When this happened to me I recovered my senses within about two weeks, but coffee smelt like a combo of burning plastic and rotting flesh for several weeks after. To this day (six months later), certain things smell different than they did before: low tide, poop, some foods when heated. [edit: and they all smell like the same thing]

Wow, that's weird. Can you describe the "new" smell?

Not particularly well - it's ... less offensive, and sort of a combo of fishy, oily, and vegetative?

I have the same questions ... I heard reports of people that didn't recover their senses weeks after recovery

My wife lost her sense of smell and taste, likely from COVID, back in March and has not yet recovered it. She has recovered "impressions" -- things smell or taste bad or good, but can't distinguish an actual identifiable odor.

In my case the symptom lasted for 3 days. In my wife's case, 1 week. In both cases the recovery was 100%.