Summarize:

If you'd like to speed up the deflating process, try using a vacuum to quickly pull air out of the mattress. You can use an ordinary home vacuum, a shop vacuum, or any other machine that can create a suction for this purpose. Simply open the air hole, wait for air to begin leaving the mattress, and hold the vacuum hose or nozzle over the hole to speed up the deflation.
To save time, use a vacuum.