To answer the OP, I received spin training at about 40 hrs. We went up in a '46 7AC Champ and did them every way, different entries, etc. But the airport I trained at is kinda unique in that respect.
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Maximum during certification is 3 turns. Beyond that, you're a test pilot. Some trainers can get nasty above 3 turns. I knew a guy who got into a spin in a Tomahawk with a student of his. They couldn't recover, a barn broke their fall. His face looked like a jigsaw puzzle from all the plexi cuts. If that barn hadn't been there....
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Interesting...I've never heard that before. Of course I've only spun a Cub and Champ, and in the Champ (with instructor) we finished the lesson with an 8 turn spin. Other than a sensation of speeding up, recovery wasn't any different or harder.
Every plane is different.
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