Duration

•  05 to 10 hours (9)
•  10 to 15 hours (7)
•  15 to 20 hours (4)
•  20 to 25 hours (1)
•  25 to 30 hours (1)
•  30 to 35 hours (1)
•  less than 5 hours (51)
•  more than 40 hours (10)