With a mostly mild case, it took me three weeks approximately, for my full sense of smell to return.

I lost maybe 85% of my sense of smell, and 1/2 the sense of taste. I could no longer smell anything in the air, atmospheric scents. Like if you walk into a restaurant you might be able to smell food broadly in the air; I couldn't smell what was cooking on the stove six feet away. I could only smell something if it was right under my nose (within ~20-30cm). A lot of people seem to totally lose the sense of smell, I didn't reach that level (and it still took most of a month to return).

For me, it started to return a bit over a week after it was first lost, and recovered to mostly normal after about three weeks.

Same here. What's was funny about losing my sense of smell is that unlike vision or even hearing, it's hard to remember how strong things were supposed to smell before, so it was also hard to know when it was fully back. But at around 1 week I smelled a raw leek and got a whiff of something and then within about 2-3 weeks, it wasn't noticeable anymore.

Absolute same - a vague whiff, tastes coming back to food with varying strengths depending on what it was, then a return to normalcy. I'm still not sure if it's back to 100%, simply due to the fact I also never really had a mindful baseline of what was normal.

It took about a week to be back fully.