Longest trip to day for me so far would be 8800 miles in 9 days, in 2006. Road out to California for work, after work was over I met up with a friend down in San Diego ... then we proceeded to ride from San Diego out to Jacksonville and back in 4 days, completed a loop around SoCal to wrap up 5K in 5 days, saw him off on a border-to-border insanity (I was his Mexico witness), and I road back to Texas.
Longest single day has been 1,515 miles in 23.5 hours, although last weekend I came close to beating that with 1458 miles in 22 hours.
Next year, motorcycle gremlins willing, I'll likely reset both my single day high mileage and longest trip mileage. I have an addiction that only Michelin can slow down.