Ed, cucumbers even in the best of circumstances, are not long lived. They always end up a ratty mess by the time they need to be pulled out. But as long as one gets a good crop of cukes before that happens then it's a win.
Some of the better more disease resistant varieties last longer than others.
I have vines that I pulled two weeks ago, I have vines that should have been pulled already but I don't get to it cause of the heat, and I have cukes that are doing great and still going strong.
