I have to smile at the guys here who say that their costs reduce because they fly more ... how does that work then ? Just because you amortize your fixed costs across more hours per year, you're still spending more in total by flying more, with increased fuel and maintenance costs - not to mention decreasing the aircraft's value with increased hours.
"Good news, darling : although I've spent £20K on flying this year instead of £10K, my hourly costs now look really good. I'd suggest a holiday to celebrate, but unfortunately we're skint ..."
Oh yes, the original question ... around 150 a year.