CALLING ENGINE GUYS/GALS

I don’t know why the Lycoming would take 2 hours to seat rings. I can’t think of an automotive engine that takes more that 3-4 pulls on the dyno to get the rings in. If it takes more than that, ring seal is compromised and you can never get it back.
Maybe load related? Rings always seat quickly with lots of load. WOT pulls on a dyno or burnouts always work great.