As you can see below, after cancelling my 250K share AON order (which was open for about 1/2 hour) and replacing it a 250K share order with no restrictions, I got filled in less than 9 minutes (with a 200K block filling in only about 2 1/2 minutes):
Status Action Quantity Symbol Type Price Act. Price Time-in-Force Reported Filled Buy 50000 LBSR Limit 0.036 -- -- 13:24:59 04/06/11 Order No. 7435117996 Liberty Star Uranium&metl... Entered:13:16:40 04/06/11 Reuse
Filled Buy 200000 LBSR Limit 0.036 -- -- 13:18:44 04/06/11 Order No. 7435117996 Liberty Star Uranium&metl... Entered:13:16:40 04/06/11