I'd suggest at least doubling, if not tripling, the duration of each scene.
Depends what he's going for. If he wants this to just be an interest-grabbing piece done in a classier version of something like MTV Cribs, then he's nailed the style. If the video is supposed to give a complete picture of the house and be a stand in for a real tour, then yes, it's too fast.
Considering the clientele for that location and house, I'm gonna guess it's the former, and I think it works. It opens up all the possibilities and would get someone to schedule a viewing. He also has photos if someone wants to see closer details. The pacing is important for keeping interest, and some of those shots being 3x longer would definitely drag. There's a few shots you could leave longer; or that could be done on a more traditional slider instead off the glidecam to be smoother, but generally I think it works. If anything, the clip lengths are a little too similar. Putting a few quick shots followed by a little longer one can add emphasis, and I think that's a technique you could utilize more. Maybe start closer in on the details and cutting out to a wider shot of the room. That would help to give a fuller picture without risking the pacing you have.
I'm not familiar with real estate photography in general, but I think the HDR effect of some of the photos is a little strong. Definitely makes the house seem bright, but, also a little surreal. But it wouldn't surprise me if thats pretty standard for RE photos