Probably 1 in 12. But, you can check yourself. Start a cleaning rod with a reasonably snug patch, mark it with tape or a sharpie and push it till it makes 1 turn. Then measure how much length of rod it took to rotate one turn.
This ^^^
If we live long enough, we all have regrets. But the ones that nag at us the most are the ones in which we know we had a choice.
