"After a minimum of 3 blades (i.e. one full rotation)"
That will result in almost two full turns of the engine, i.e. a full 4 stroke cycle on each cylinder with each cyl. starting from a different position.
Douglas DC-3 Dakota Propeller reduction gear ratio:- 1 : 0.5625
So a turn of the engine turns the propeller a bit more than half a turn.