Requests are made via the Calendar for each of the respective Sandboxes.
A minimum of 24-hour notice is rquired when making a request to allow
time for preparation of a Sandbox,
time zone differences, and to resolve any
scheduling conflicts.
The process for booking is similar to booking a conference room.
Choose a day and time that is open, for the Sandbox you're interested in using,
then choose the open hours that work best for your schedule.