yes! many times on a four man team. mostly GA, and NJ. it can be alot of fun, with the right group. no cry babies. its wet, its cold, its hot, its all that,
the 3-4am laps, are tough, there you are tired from riding all day, youre in a warm sleeping bag, its raining on the tent, your clothes are wet, and its your turn at the wheel! what do ya do? shut up and ride, my favorite lap is dawn, to see the sun come up over the ridge is beautiful, its a test of mind and body, if either breaks down your done.
do it atleast once. with GOOD friends, its an event.
i also have done local 12hour rides here in FL, on a two man team.