dancqu: I can't see any reason why it wouldn't be long lived, but the only way to really find out is to test it. Ascorbic acid is an anti-oxidant, and, if anything, it should inhibit any deterioration. I haven't tried it, but it should also be possible to mix this developer as two stock solutions, keeping the carbonate separate. This is a well known technique for extending the life of Ansco 130.