Doing 900 hours plus p.a. equates to over 90 per month. (Assuming 42 days leave p.a.)
I must have a different calculator to you, 3 holer.
Assuming 6 weeks leave, a pilot works 10.5 months a year. 900 hours divided by 10.5 months is about 86 hours a month. Or based on 46 weeks work, about 20 hours a week. Say four hours a day(average) over a five day week.
Nice work if you can get it.