Over the years, we've had an engine replaced, a transmission replaced, and a complete rear axle assembly replaced in various motorhomes while traveling. The rear axle assembly took the longest at 2 weeks, mostly due to delays in finding a suitable donor unit and getting it shipped in. The engine took just 10 days, and the transmission 5 days, both including shipping time. We were able to continue staying in the RV in all cases, other then while it was actually being worked on. For the transmission R&R, the shop towed us to a nearby RV Park while we waited for it to ship in. The replacement itself only took one day. We just "roll with the flow" in those situations and make the best of it.