With this information, you can calculate the quantity of hours 640 days is equal to.
¿What is the inverse calculation between 1 hour and 640 days?
Performing the inverse calculation of the relationship between units, we obtain that 1 hour is 6.5104167e-05 times 640 days.
Which is the same to say that 640 days is 15360 hours.
Six hundred forty days equals to fifteen thousand three hundred sixty hours. *Approximation
A hour is six times six hundred forty days. *Approximation
