Question: When can the bidding end? And the answer is NOT when three players have passed. It's not that easy. The bidding may not end until one person has limited their point count. Then the other partner can do the math and place the contract.
The simplest example is when your partner opens 1 No-trump. You know Pard's got 15 to 17 points exactly and you know fairly well whether you belong in game with your 10 points, or should pass with your 6.
We're going to be opener in each of the upcoming hands, and ultimately we'll be placing the contract. The key to success is to Do The Math. Whomever knows how many points their partner has is in position to place the contract. Get your fingers and toes ready for the count.