I have some proofs in the gallery today that was printed with 500ml dektol stock over a period of 11 days.
The developer was left out the entire time, covered with saran in contact with the liquid.
I printed maybe 75 proofs over 11 days, in 3 separate sessions.
F5.6 for 10s, dektol at 75f for 90s on day one.
F5.6 for 10s, dektol at 75f for 90s on day eleven.
Developer at 75f has very little dissolved oxygen. Cover it with saran in contact with the liquid, where will the oxygen come from? For big trays, I cut up kitchen bags.
Dumping it into a bottle, you might as well put it in a blender.
I might add, eleven days is not the longest I've left dektol in a tray, and it was still good when I dumped it.