It's just not possible to answer the OP's question. He or she hasn't even defined what aircraft type to apply the question to. Homebuilt or factory? Single or twin? 2 or 4 seat/fixed gear/4 cyl or 6 seat/retractable/constant speed/6 cyl turbo? Hangared or parking fees? New or 2nd hand? How many hours left on the engine & prop? Insurance for the type of operation & will it require some sort of annual recurrency training?
Utilization makes a huge difference. Fly a single hour per year and all the fixed costs have to be covered in thatsingle hourl's cost. Fly the same aircraft for 1000 hrs and the fixed costs/hour are only 0.1% of the single hour situation. For example, let's say the annual costs come to $10,000. That sole hour/year will cost $10,000 + variables such as fuel. Fly it for 1000 hrs and the cost per hour drops to $10/h + variables.