Never really worry about steeping to much. For a couple days I open lids and squeeze out air and new air and shake well a couple times for a couple days. I keep at least 15 140ml bottles all mixed ready on my vape shelf at any one time. I put dates on them so I usually look for the older date when I need a new bottle. Some flavors turn dark over time and if I see one going dark I will grab that one and vape it. So I guess you can call it accidental steeping. Fruit flavors which I mainly vape don't need steeping anyways. Kids come and I mix them bottles I tell them just to take lids off and let air in and shake a few times everyday. Weather they do or not is up to them. They just like the free ejuice & free coil program. They only get the amount of coils they bring back to me for rebuild. LOL CHEERS!