Mack Boring said cycle the 50/50 solution 15 minutes, let it sit an hour and then cycle it another 15 minutes.
Rydlyme’s customer service rep said to just run the 50/50 mix for an hour and a half.
So I decided to blend the two instructions together and came up with run it for a half hour, let it sit for a half hour and run it again for a half hour. Since both methods suggested to me had a total time of an hour and a half I kept that the same. My first half hour I ran it in reverse flow, the second run was in the normal direction.
Utilizing the washing machine hoses allowed me to simply connect the garden hose when I was done and run fresh water through for 15 minutes in both directions. This also cleaned out my adapter fittings and washer hoses.
If anyone is interest in doing a flush I can throw the 2 adapters and hoses in a box and send them to you. I’ll cover the shipping – Just ship them back to me when done.
Adapters:

Pump & Washer Hoses:
(You can see how the Rydlyme took the shiny finish off the brass ends submerged in the bucket)

Running:
(The 110 outlet at the starboard helm came in handy for plugging in the pump)

Lower connection at Exit side of Cooling Water Pump:

Upper Connection at Exit Hose from Heat Exchanger. Removed from Mixing Elbow. Don't forget to remove the cooling water pisser hose for the shaft seal and cap that off:
