Hi Ryan, we work together, me and Mrs Cozy. We have very compact rounds of Brit custies, and we aim for 20 to 25 a day. Standard Brit house here takes about 10 to 12 minutes. We also do alot of chinwagging with custies and drink lots of tea.
I can't compare this to our German custies, as they are a totaly different story. On my own, on our compact stuff, I would expect to do about 15 a day. We only work about 4 to 5 hours a day, so hope this helps.
Another point though. Don't worry about speed at first, just quality. Don't try to run before you can walk mate.