In reply to ANdrew123:
how long is a piece of string?
how fit are you and how often do you do long runs? some people can do daily marathon distance runs, others do one every blue moon, both are going to recover differently.
The first time I did the 3000s in 14h i wasnt that adapted to the distance/descent and took me about 2 weeks to recover. Last time I did it in about 10h I was ok in about 3 days and back to normal training in about a week
For me recovery - rest, compression socks, fluids, protein.