Hello Wrench 1, from the fellow who did the two S-92 auto’s. You only have to do one, successful data point that meets the FAA criteria. FAA Part 29 doesn’t require a set of maneuvers etc.
In our case, we did the first one and it was fine, EXCEPT that in getting the N2’s close, in case I called for power at the last moment, Bob Spaulding nudged the throttles a bit too much and one of the engines N2 actually joined the Nr trace just at touchdown. That engine torque was zero on the data traces, so we could have successfully argued the point, but the first one went well enough* so we had a short conversation with the telemetry crew and decided it was easier to do another and not have a tenuous discussion. That probably also answers your second comment.
*Knowing that we were going to do a full on auto sooner or later, I ended a lot of flights with a power recovery auto just to get comfortable with the speeds and flare point, pitch rate and max attitude. And of course on the day in question, we did a couple of power recoveries as a warm up for everyone involved.