NASA reports the oxygen generator on the International Space Station stopped working again and that the station's crew hasn't been able to fix it. They will need to wait until August for replacement parts but there is still enough reserve air supply for about five months.
As it stands, oxygen supplies in a Progress cargo carrier now at the outpost will last until May 22 or May 23.
The crew also is equipped with oxygen generators that work like drop-down emergency air supplies on commercial airliners. Supplies from those would last until early July. Beyond that, there is a 100-day oxygen supply in tanks attached to the station U.S. Quest airlock.
The total air supply for both passengers now onboard of the ISS is good for about 140 days. More details at Space.com