"Gregory Hall" wrote:
On Dec 2, 11:31 pm, " wrote:
24 hours in a day. 365 days in a year. That's 8,760 hours in a
year.

How many hours did you fly last year?

Pretty difficult to fly hours. You can fly an airplane, a ballon, a
kite etc. but you can't fly an hour.

How many hours did you spend flying last year would be the literate
way to ask the question.

Colloquial language. Used not just by ordinary people, but great authors.
Try some today.