My doctor instructed me not to sit at all (when avoidable) for 4 weeks, at which point I could sit on a Boppy pillow.
His staff also taught me a trick whereby you place a yoga roll under the backs of your legs and use a pillow to support your back, allowing you to "sit" with your butt hovering in the air and not touching anything.
I was also sent home with a travel letter explaining that I needed to be allowed to stand whenever protocol allowed, which I gave to the flight crew on my plane home, and they let me stand at all times except takeoff and landing.
I ended up staying in Miami for almost two weeks, which may be unnecessary for some, but my recovery was so difficult that I would not have been able to stand for more than maybe 20 minutes at a time before the 10 day mark. Obviously other people, Jenny for example, have a really different recovery.