You need a time factor.
To keep any wheel spinning steady state, you need only produce the power needed to overcome resistance (friction or air drag).
Usually, greater power is needed to CHANGE the present speed, from stopped to some rotational RPM, for example. And, how fast you need to change the rotational speed, vs. the mass of the object.
As long as you provide more power than friction or air drag resistance, the rotational speed will increase. How fast it increases will be determined by the mass and magnitude of the power over friction and drag factors.