4 to 8 lbs = 1.5 to 3.25 hours
6 to 8 lbs. = 2.5 to 3.5 hours
8 to 12 lbs. = 2.75 to 3 hours
8 to 12 lbs. = 3 to 3.5 hours
12 to 14 lbs. = 3 to 3.75 hours
12 to 14 lbs. = 3.5 to 4 hours
14 to 18 lbs. = 3.75 to 4.25 hours
14 to 18 lbs. = 4 to 4.25 hours
18 to 20 lbs. = 4.25 to 4.5 hours
18 to 20 lbs. = 4.25 to 4.75 hours
20 to 24 lbs. = 4.5 to 5 hours
20 to 24 lbs. = 4.75 to 5.25 hours