1 or 2 days off is more standard. 3-4 seems like too much.
When looking at the Friel book, at 350 annual hours, R&R weeks will be 4 days of riding. Once you jump to 450 annual hours, then it's 5 days of riding. I believe most Expert racers train around and over 500 hours.
I've had a couple of coaches in the past give me either 5 or 6 days of riding on the R&R week. And it depends on the training cycle (3-1 vs. 2-1) and some of their personal philosphy. Depends on the training load of the build week. I think it also depended on Masters racer vs. non-Masters. It also depended on available time and doing the things off the bike that gave the capability to handle the load.
So the answer is........"it depends."
BTW, I'm not a coach. But I did sleep at a Holiday Inn Express last night. ;-).