As separate words, it is plural.We just finished sixteen hours on the job.As a compound adjective, it is singularWe just finished a sixteen-hour shift.
no
960 minutes
If you take 365 days a year (not accounting for leap years), then we have 24 x 365 x 16 = 140160 hours in sixteen years
8 Hours.
16 hours to one day is 16/24, which reduces to 2/3. Twenty days to June's length is 20/30, which also reduces to 2/3. It is true. Sixteen hours are to one day as twenty days are to June's length.
sixteen and a half hours
Anywhere from 0 to 24 hours, depending on your latitude (how far north or south of the equator you live).
Definately not. No US law prohibits that.
twenty four hours a day 2 cm or ¾" long
six hours
Twenty four hours is the length of any day on Earth.
As separate words, it is plural.We just finished sixteen hours on the job.As a compound adjective, it is singularWe just finished a sixteen-hour shift.
The duration of Twenty Hours is 1.83 hours.
The duration of Sixteen Candles is 1.55 hours.
The duration of Mom at Sixteen is 1.43 hours.
Two hours, sixteen minutes, and twenty seconds, assuming that all variables are fixed at maximum efficiency.