Oh yeah temperature is 30 to 33 I know that matters for how much DO the water will absorb. Not as important to me as am I getting in as much DO as possible. I've been waiting 3 hours. I can't find anything online about time it takes to reach maximum saturation.
pumps pushing air stones are one thing but the bubbles rise to the top and release their payload, if you want maximum oxygen saturation then look at electronic O2 emitters - they turn the water from clear to white from the amount of added oxygen, this is same tech used in live keep wells on fishing boats