Hi Chin,
You cannot enable 3 columns to allow zero minute. Rather you can disable Allow Bidding Overtime.
When overtime is enabled, any bid received too close to the end of the bidding period extends the bidding period. Overtime gives participants additional time to respond to late bids of other participants. It benefits the buyer to allow other participants to further improve their bids. Therefore when buyer Allow Bidding Overtime they need to specify below 3 fields:-
Bid Rank That Triggers Overtime
Start Overtime Period if Bid Submitted Within (Minutes)
Overtime Period (Minutes)
Regards,
Aditya