Duration

•  05 to 10 hours (15)
•  10 to 15 hours (13)
•  15 to 20 hours (8)
•  20 to 25 hours (5)
•  25 to 30 hours (4)
•  30 to 35 hours (1)
•  35 to 40 hours (2)
•  less than 5 hours (64)
•  more than 40 hours (16)