In a M3W - My guess is less than 250 miles but I have only driven a Trike about a mile so I like experience.
In My DHC I can do easily 8 Hours, however I am using a early +8 seat not the original.
In My '63 +4-4Str easily 10 hours with a break for lunch, however I have modern Leather Morgan seats - sourced from MMC.
Last week, in My +8 Bitsa with Roadster seats I did 12 hours, 650 miles, no lunch break only fuel breaks. I could walk when I got home.
