Liquid developer suggestion

[Harry Lime]

I just got my first bottle of ilford's DD-X

how long does that last??

Press the air out of the bottle and screw the cap on tightly. I also put some plastic wrap between the screw top and bottle, for a better seal. You could also divide it among a few small brown, glass bottles.

I think Ilford recommends 3-4 months, but check the PDF on their site.