I tested both MBA and MBP adapters on my rev C MBA. Both from completely dead fully charged in approximately same time. Futhermore, the MBP charger has to be plugged in while the MBA is overhanging edge of desk. Basically, it's a pain in the arse! Another thing, the 24" LED ACD is the best charging station possible. It's like the perfect docking station and it has the MBA style adapter. I highly recommend it for $599 refurbished. I have one MBA charger at my couch, leave one in bag, and use one from ACD at desk. It is the absolute perfect setup!