sounds about right mate, my own is nigh on constantly in hot weather and even when its chilly the fan is comes on every 3 or 4 mins if sat stationary,
as yours, once on the move it sits at halfway or just under, as long as your not overheating or losing coolant you should be fine
i have tried different clocks and relays in mine and they all read different when hot
with yours its just a case of getting to trust that the system is doing its job. keep a can of coolant and a few spares and tools in the car