Everything here is from the references shown below, with a few comments in an alternate color.
PERFORMING THIS ACTION TERMINATES FLOW OF OXYGEN TO THE CABIN. CONSIDERATION SHOULD BE GIVEN TO DESCENDING TO 15,000 FEET OR BELOW FOR THE REMAINDER OF THE FLIGHT. AVAILABLE PORTABLE OXYGEN BOTTLES MAY BE DISTRIBUTED TO PASSENGERS REQUIRING OXYGEN ASSISTANCE.
To determine available oxygen duration, refer to the appropriate AFM Supplement.
Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019
Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019
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