Recovery time for 50k

I haven't done 50ks, but for the 50 mile runs I've done, I've recovered pretty quickly, much better than a hard run marathon.

I'm sure there is some variability with course difficulty, and how hard you run, but I find recovery from trail running shorter than road racing.

I'd say a hard run marathon, I'd be looking at 2 to 3 weeks before I started feeling somewhat normal. For a 50 mile race, I'd likely be feeling pretty good in 1 to 2 weeks.

+1 No 50K but I felt pretty good after my 50 mile trail run and was back to "normal" within a week or two.

If it was a hard race, take a day for every two km before you race again. In other words, don't race again for a month. This is a general rule of thumb. Some are able to run sooner, some later.

That is encouraging. I have my first 50k in June and a 100 mile gran fondo (12,000' of climbing) a week later. I am concerned about how my quads are going to feel.

Totally dependent on terrain, level of effort, and how it compares with your typical training runs.

I live in a really flat area. I've recovered from all the Texas area 50ks with no problems...a few days of soreness, but back to feeling normal in a day or two. Did a "mountain" 50k over in Tennessee with 6000+ feet of steep, technical ups and downs and it clobbered me for weeks. I could hardly walk the next day. MUCH worse than any marathon or even 50-mile recovery I've experienced.