ACMI programmes include fixed amount of hours, usually starting from 60 flight hours per month. Flight hour price depends mainly on jet class and model. Here is some estimate:
Light jet, 5 - 6 seats - 1,500 euro/flight hour
Mid-size jet, 7 – 8 seats - 3,000 euro/flight hour
Heavy jet, 10 – 12 seats - 4,000 euro/flight hour
Also there are additional parameters that will influence the final costs: number of passengers, homebase airport charges, region of operation, fuel prices, airport fees, catering wishes.