MD PA stands for Medical Doctor, Professional Association. The Professional Association designation is a legal term used to describe a separate legal entity, much like an incorporated business.
Uber launches Scheduled Rides, so you can (finally) book a car in advance. users will be able to schedule a pickup anywhere from 30 minutes to 30 days in advance.
Usually the biggest delay is getting from the offer to the contract which can take weeks. The banks typically prefer a quick close, many ask for 30 days. If you have cash, I don't see why 21 days wouldn't work. Shorter than that is hard due to all the paperwork and authorizations the bank has to go through.