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
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960 minutes
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.
531
sixteen 5 + 11 = 16 = 23 - 7
no