Dear MDs of sci,

once you notice your oxygen saturation dropping below 95% due to covid, how long do you have to get to hospital / ambulance?

Asking about my grandma who is 94 (not sick atm).

Basically, would it be helpful to get hear a 9L bottle of pure oxygen, see pic rel to give her some extra time to wait on the ambulance?

Ambulances tend to take their time in my shithole of a country.

Also, if she desats, how should she use this bottle exactly? Take every other breath from the bottle until spo2 improves?