FCOM: 35 - Oxygen

Question 2

How long should cockpit oxygen last?

Answer 2

OMA divides requirement into flight crew, cabin crew and pax.

For flight crew: Entire flight duration when cabin alt >10,000ft (minimum 2h)

Not sure where this info came from, but:
“13, 15, 1*7”

Worst case:
13 minutes:
- 3 flight deck occupants, emergency descent (diluter set to NORMAL)

15 minutes:
- SMOKE scenario, 2 fight deck occupants (regulator set to 100%)

Best case:
107 minutes:
- Cruise at FL100 with 2 occupants