It's probably being recorded as we speak. If lines closed at 8:45pm, they would have probably dress rehearsed the group numbers and then got on with the proper recording by now. From my experience of being in the studio, there is a small break of about 15/20mins after the end of the live show but they keep the girls busy dress rehearsing the results show, probably so they don't let the nerves build up.
Also with the recording, they don't play out the VT's, the director cuts where the VT is inserted into, then they go straight onto the next bit, so that greatly reduces down the time of how long the results take to record because on the Sunday show it is mostly made up of the re-cap, girls/families/panels reactions, Toto VT's, the mission VT and the 'who do you not think is Dorothy/who would you miss most' VT. Sooo, I would predict that the results recording will be finishing now and we should get the spoiler about half 10 if it starts to leak on Twitter/Facebook. It may actually take longer if someone has to travel home and post on here.