As mentioned in my book they were filmed during sessions for time to get alone in October 1968
All of it? I'm only asking because I thought the music for that had already been tracked by October 1968 and it seems they are, in some of the shots, tracking music as well. By the looks of it, the song is pretty upbeat - check out what Al is playing on guitar at 0:55 or the drums that Dennis is playing at 1:14. It looks like Dennis and Carl are doing two drum parts at 1:35.
It seems they were at least rehearsing another song there as well. But, again, there are multiple days that we are seeing here.