I will have to remember that about the hot bath steep and losing 3%.
I will test that when I have a chance. I made a note of it.
However, I do this with all of mine, and generally within a day to one week the steeping is done.
Sometimes, right away after cooling.
I use hot water from our water cooler that gets about 140* in a coffee cup, I place the juice I made in there for about 10min
then take out and shake and place it back, I do this about 3 times and that is it. The water will drop it's heat pretty quickly.
I don't open it again till it has fully cooled off, and only if I want to vape any of it. Otherwise, leave it till you are ready, about 3 to 7 days or so. If it tastes good, then vape on, otherwise, close it and wait.
I have only left the cap off a banana chocolate for a few hours cause I could tell it needed it, but I have not vaped it yet.
Personally, I would not ever leave the cap off unless it really has an overtly alcohol or high smell from a strong flavor.
And in the future, I may do that, but put the nic in after that time had passed, then let it sit for a day or more without opening it, due to the oxidizing and potential for it to lose the mg level. That's a waste in my opinion. Which is also why I will test that 3% theory.
If I do lose that 3% by doing that, I will add nic later when ready and then let it sit for a bit and shake every so often.
Then test and adjust as needed.