MIT here, and we have data on daily block hours utilization for (at least US) airlines and the verdict is that it's consistently in the 9 to 10 hours per day range. But that daily usage works out to about 70 hours a week per plane, with 80 giving you 11 hours daily utilization.
http://web.mit.edu/a...ft&Related.html
http://web.mit.edu/a...ating Fleet.htm
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