30 seconds sounds like a reasonable time for a triple balance, and probably 25 for a double.
I know our driver can do it in 3 seconds but I'll give him another 3 so he can get the bridge down so I'll say 6-7 seconds for a solo balance and we'll see if we can get it down to 5!
http://www.youtube.com/watch?v=5cFgKrVrC4I