If the boy was 6 years old on the island when he got there and aged to 50 by the end of the movie, then he spent 22 hours on the Island
1 hour on the land = 2 years on the Island
Age of the boy when he got to the Island = 6 years
Age of the boy at the end of the movie = 50 years old
Difference in the boy's age = 50 - 6
Difference in the boy's age = 44 years
Since:
2 years = 1 hour
44 years = 44/2 hours
44 years = 22 hours
The boy was on the Island for 22 hours
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