Turned on, one at a time. I don't leave mods on if it's regulated when I'm not using it. I don't leave batteries in them either if it's going to be sitting for more than a day.
I have one in full ready mode. I also have a Reo Grand that is cleaned, built and wicked. I just have to put
juice in the bottle and squonk and put a battery in. It would take 30 seconds to get my Reo up and running again. However, I strictly vape unflavored now in everything, so I don't have the worries of filling up different devices with different juices.