I've probably about 6 hrs on the corner trims,but the whole motorhome I would guess a full 4 weeks if your counting 8am to 5pm, although its difficult to say as I've been doing days here and days there when I've been able to for past 7 months since purchasing.
I've more or less stripped the whole thing and gone through it, Cab & chassis are spot on, it was the habitation side that was requiring a lot of tlc.
Still a few bits to tidy like restick edges of plastic scuttle and remove/re paint wiper arms, but the list is getting smaller, I'm trying to find direct fit/replacement led body marker lamp units aswell but all ones I've seen are slight different shape.