Hi!
If you set a trigger to be executed once per 3 minutes and add the condition that checks the current time is between 00:00:00 and 00:05:00, then trigger will be only executed once.
But yes, you will need a market (any market) to be refreshed at that time, for triggers only work in refreshing markets.
aha I can use total_won can't I!?
I guess you can, but I'm not sure for what purpose.