When I do it by hand it's 10 seconds per minute. Which I thought was the Ilford way. 5sec per 30 seconds I thought was the Kodak way. Some of this is related to how long you develop. If you're at the low end of the time range then I think the 5sec every 30 is going to make more sense then if you're using a dilute developer and looking at 15minutes.

With the motorbase I've no idea how fast it goes.