Saturday: Leave at 1:00PM for 2 hour drive to a 3-4 hour birthday party. Home by 9PM and will be beat.
Sunday: Leave at 8:15AM for a 1 hour drive to a 2 hour business meeting. Leave at 4:30PM for a 30 minute drive for a gathering of friends. Home by 9PM and (again) will be beat.
So at very best: 4 hours on Saturday and 4 hours on Sunday. Boooo,