What does this article add?
There are a few studies which have different results about the complications in terms of the operation time. In order to clarify this issue further studies are needed. In this context the data about this matter have been presented in this study. If the optimal operative time is determined correctly, the risk of infection associated with prolonged opearation time can be avoided or other relevant measures can be taken. In this study we aimed to established the optimal operative time by ROC curve analyses to determine a cutt-off value for the operation time, and the effect of the ureteral access sheath on this time.