Thats nothing unusual. Bear in mind that most muds continue to count time even if you are idle, and a lot of people just leave themselves logged in over night. (Not that I'm saying Abigail does this, but some of those hours are bound to be idle ones.)
(I started in 1993 and have probably around a 1000 days online-time, if I add all the various muds together that I played (averaging about 150 days on each one..))

C.