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18 hours
You need to specify a unit. 6.15 what? 6.15 trillenniums would be 53910900000000 hours. 6.15 nanoseconds would be 0.00000000000170833333 hours
You would use: 135/60 = 2 hours 15 minutes or 2.25 hours
2 half hours would be 1 hour
To calculate the number of hours in 19 days, you would multiply the number of hours in a day (24 hours) by the number of days (19). This would result in 456 hours (24 hours/day x 19 days = 456 hours).