I don't count the days, I just record the mileage. But the R65 days are usually a hundred miles, as that's my round trip commute.
R65: 7,464
...about 1,400 miles on my bicycle, a Salsa Fargo 2. That's the mileage I want to increase.
Less than 5,000 miles on my '81 Toyota pickup.
Edit: sheesh, I spent almost a thousand bucks on that R65 last year in parts. About half in tires. To be fair, I rarely need to buy two sets in one year. I haven't paid yet for the valve seat replacement, just for some of the parts.