Cessna produced a pamphlet in the late 1970’s that expanded on the spin for all Cessna SEP’s by model. For all models the first 180 deg of rotation was considered the spin entry and a normal stall recovery ( ie start with pushing wheel forward) could be used. Only after 2 full turns is the spin considered fully developed and the POH spin recovery method should be used.
The bottom line line for an initio is if you are teaching spinning where you let the spin wind up so that a full spin recovery should be used you are providing negative training as the pro spin controls must be maintained in order to get the aircraft to be established in a spin. The objective of the exercise should be to instil the automatic and instinctive reactions so that the aircraft never gets near to an actual spin mode.