If you begin a set, and come back >3 hours later (and close your browser or otherwise trigger a page reload when you resume) we'll restart you where you were in your set, but we won't save a set finished record for you when you finish it. This is because in this scenario we allow you to continue on to do another set, and because the two sets are effectively conjoined we just save a set finished record when the second set is finished.
If you begin a set, and come back >3 hours later (and close your browser or otherwise trigger a page reload when you resume) we'll restart you where you were in your set, but we won't save a set finished record for you when you finish it. This is because in this scenario we allow you to continue on to do another set, and because the two sets are effectively conjoined we just save a set finished record when the second set is finished.