for = at some point in the duration of a period of time before an hour has passed for another hour = at some point in the duration of 1 hour from now till one hour later from now. OK 2 OK
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HelaBoth are ok. You can also say "I spend at least six hours in front of a computer", or, "I spend at least six hours at the/my
Another question please :
I've had to go the doctor about my eyes. I spend at least six hours a day in front of the/my (is MY possible here?) computer.