https://amp.theguardian.com/science/2021/jun/12/jeff-bezos-space-auction-28m-spare-seat-blue-origin states:
Passengers, the company has said, must be between 5ft and 6ft 4in tall, weighing 110-223lb. They must also be able to climb seven flights of stairs at the launch tower in less than 90 seconds and sit strapped in the vehicle for as long as 90 minutes without access to a lavatory.
Why must passengers in Blue Origin flights be able to to climb seven flights of stairs at the launch tower in less than 90 seconds? Why this time limit on the stair climbing?