Oxygen chemical generating cannisters. They give 12 minutes. There are warnings at 10,000'. Automatic mask deployment at 14,000' Plenty of time even in a plane with no bleeds to sort out the situation.
This is mainly a professionals section where incidents may be discussed by professionals involved in the industry. It is of no help or interest having a series of laymen expressing astonishment or opinions on incidents they know little about. Come any incident and this place gets invaded by all and sundry. I would suggest if you are not a pilot or involved in a particular branch of the industry related to the subject under discussion, then this is not really the place for you. And that includes self-appointed 'experts' who feel they are asking cutting questions!
We have here a minor incident well handled expeditiously by the crew, now being blown up into something it is not.