As separate words, it is plural.
We just finished sixteen hours on the job.
As a compound adjective, it is singular
We just finished a sixteen-hour shift.
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48 cents an hour.
no
No, 16 hours is 960 minutes. Sixty minutes per hour = 16 x 60 = 960 minutes.
960 minutes
0.16 hundred hours, using the 24 hours system. 12.16 am, using the 12 hour system (am, pm).