After seeing the pictures that Reddit user YouYouXue posted, we can gather some useful data from one of the pictures.
The picture of the touchscreen dash very clearly shows the supercharger charging rate, how many miles of charge are in the battery currently, and how many minutes remain to fill up the battery fully. Doing some simple math, it turns out that the max charge seems to be about 235 miles per a full charge! Not too bad!
However, the supercharger charging rate seems to be pretty slow, at only 169 miles of charge per hour. That means for a full 0 to 235 mile charge cycle, a supercharger would take about 83 minutes! Some people are saying that is ok because this number fluctuates from one charger to the next, but that should not be the case with Tesla superchargers.