The English speaking guide, Helen, was excellent, and I rate her top marks, but there was not enough time to cover all three locations and lunch PLUS a couple of 'infomercial' stops that we were not expecting and had no real interest in doing. We ended up with only an hour for the Summer Palace, a huge site.
One thing that also delayed us was that I am somewhat impaired for long walking, and gave the tour organizer a note to that effect when signing up online, that I have to limit my walking. Perhaps they should have let me know that this was not a good tour for me, that being the case. If my son had not been with me, I would not have managed it at all.