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There is how fast it CAN charge and how fast it is charging. I have many times pulled into Superchargers and had to wait a long time to get back on the road. Not every time by any stretch, or I'd be pretty upset, but if you are doing planning around charge times perhaps they are going with the larger number so that they are not scheduled to pull out 24 minutes after they plug in.
Not charging enough to reach your destination is a lot bigger deal when there are only a few chargers in the world that work for your vehicle. I wonder if they come with a Mobile Connector that plugs into 120V in case of mishaps.
I think their focus this month is on getting all the Supercharger v3s up to speed for the Ford and GM customers to start using. It seems all hands on deck as they have to hit every single one and it's been taking as much as a day to do just 4 of the posts at each site. That may relate to travel time to get there and is just anecdotal.