Our LDS just went from PADI to SDI.. They have the e-learning prior to coming ot the shop. The shop has a pool onsite, so the confined portion is one weekend. Full day Saturday and half day Sunday. Normally, the following weekend is the trip to O/W. 2 dives on Saturday, 2 dives on Sunday, and if there is enough time, your first "official" dive as an O/W diver is after that. So, after the e-learning, timeline is 2 full weekends, back to back.
Back when they were PADI, there was classroom for the first half of Saturday and Sunday would be a full day. Everything else was the same.