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It is 4(1 + 3k) hours where k is any integer.
6
12 hours.
6 hours and 40 minutes, or 6 and 2/3 hours.
2 days 6 hours
2 hours.
6 and 1/2 hours
6 hours
About 6 1/2 hours.
6 of them.
Between 5 and 6 hours
6 hours and 8 minutes or 6 hors and 8/60= 6 and 2/15
6 to 6 and 1/2 hours