I find that mine produce for an average of 3 to 4 weeks before succumbing to bacterial wilt brought on by cucumber beetles. However, in disease/pest free conditions, they should last you into the very late summer or early fall. Setting new plants out now may work, but if your late summer turns out to be cool, the reduced light levels and reduced heat will signal the plant into dormancy. You probably won't get much out of them.

They do taper off after about a month of production...I plant two half rows of pickling cucs, one I plant end of May, the other a month after...some folks start them indoors a month early, plant them out, and then sow another row directly