it normally is an all day session. its normally 20-25 people 2 on the track at a time for 5 mins then reverse track for 5 mins, throwing in lunch and track changes probably looking at about 2.5-3 hours on the track each.. i can ask about doing a half day. it wont be for a while as i am needing to sort out engagement party and then how the F to convert the suspension on my s130 to a silvia set.