30 Seconds for new bids is far too much

Lots of players usually wait until 3 seconds to add their bids, then when we have a bid competition for the same player, we have at least two people waiting until 3 seconds on purpose, maybe a strategy to win by making the opponent tired of waiting. This affects the market dynamics and benefits those who like to play dirty. 

I would suggest no more than 15 seconds for new bids, keeping it quick and effective.