I did a couple tests with 4 gp regen by queuing near the end lots of score brief to see every round (adding +4 gp each).
A couple of measure as above gave me the ratio of 2 gp per second. I got 2.11 once.
Thus it follows that there is on average 2 seconds per round and with 4 gp regen you gain 2 gp per second on average. --Frazyl 10:31, 22 August 2011 (UTC)