20 turn fully developed spin in a Robin aircraft

This is my first ever spin in an aircraft, during emergency manoeuvre training with an aerobatic instructor. At the time of this flight I had accumulated around 1000 hours flying in command (many as a recreational instructor), but had never seen more than an incipient spin. We entered the spin at around 6700 feet, commenced recovery via the Beggs-Mueller method at around 4500 feet, and levelled out at around 3200 feet.