About 9 or 10. That allows daily riding, including commuting, without the need to worry about laundry. it also saves time and money by allowing a decent size load of bike clothes only.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.