Crucible, that would allow for those who say only have time to post bets on a Saturday to join in, along with others who may have a few every raceday in whatever jurisdiction. So, the comp more resembles real life betting activity for the different posters. Those that only use NZTAB can do so or they can experiment with using other operators hypothetically without opening accounts with them.
I'd suggest say a couple of months, say 1 March to April 30.