Just curious what different airlines use for the 60 minute circles during cruise. We use 424 on -700 and 430nm on -800. They used .79/330 which I thought was ambitious to come up with the 1 hour circles for non-Etops

We use 390nm on the -800.

Since they are for planning purposes only it is down to agreement with your regulator. Within that parameter, your choice of speeds.