For my last XC tour, it was about $25/day, including gear fixed or replaced along the way. That added up to just over $1,500 for a 4500 mile trip. That included roughly one motel a week and mostly free camping otherwise, and roughly one restaurant meal a day.

I travel on the frugal side, though some spend much less. I met one cyclist living on about $5K per year, traveling about 8,000 miles per year, less than a penny per mile which is pretty incredible.

Or you could make it a 90 day spa-to-spa trip and spend well over $10K. There are so many variables in traveling style and speed, it's impossible to predict your costs.