7 hours and 23 minutes
I have a difficult (and exciting) schedule on Friday - 49 scheduled* galleries in Chelsea and 13 scheduled* galleries in the Lower East Side. Over the years of gallery hopping I've determined that my "top speed" in Chelsea is about a 6 minute average at each gallery with a 30 second travel time average between each. The Lower East Side is more like 4 minutes per gallery & 3 minutes travel between. With the transportation from Chelsea to The L.E.S. I'm looking at approximately 7 hours and 23 minutes if I don't take a break**.
Saturday I will see galleries that don't open until the 12th (i haven't even looked at the list yet) and return visits to anything I found interesting on Friday.
* I have a computer aided system that schedules me to see all shows at galleries that I have rated highly in the past. To this I've added shows I've heard about that seem interesting. This does not account for many galleries I walk by and enter on a whim.
**I have a bag of trail mix and a bottle of water, which I use sparingly to eliminate bathroom breaks.