If you are following true two lane courtesy, then as long as the bowler on 3 was ready to go before the bowler on 1 started, he should have gone first, no matter how long the bowler on lane 2 was standing there. If the bowler on lane 3 was not ready to go when the bowler on lane 1 started, then as long as no one was up on lane 4 the bowler on lane 2 can go. That is two lane courtesy.
From my experience if you want two lane courtesy to work well, the PBA version is the way to go. It keeps the pace moving a lot quicker then just regular 2 lane courtesy. And if someone is off getting food/drinks/etc, it won't disrupt the PBA version.....if there is no one getting ready or ready to bowl on a pair to either side, then you go, you only wait if there is someone there preparing.
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Jorge300
"Some time, when the crew is up against it, and the breaks are beating the boys, tell 'em to get out there and give it all they've got. And win just one for the Zipper. I don't know where I'll be then Doc, he said. But I won't smell too good, that's for sure."