In practice most negotiations settle within two or three rounds, because each exchange carries a real deadline and neither side wants to lose the deal to a competing offer while the back and forth drags on.
A negotiation can stall for reasons that have nothing to do with price, most often possession date or included chattels, and those non-price gaps sometimes take longer to close than the dollar figure did.
Joel Dyck knows when another round is worth it for a Saskatoon seller and when it is time to accept. Get your hand-reviewed valuation from Joel Dyck.