Personally I do not count shipping time as steeping time. I do not feel that steeping begins until oxygen gets mixed with the juice through vigorous shaking introducing micro bubbles to the juice. Then there's the evaporation of alcohol that some flavors are based in, and that's not going to happen with the top on.
Generally speaking tobacco flavors need more steeping than other flavors but there are tobacco juices that are great right out of the mail, I prefer fresh Boba's Bounty over well steeped Boba's. Although there is nothing wrong with aged Boba's and for some it's the other way around.
Try the juice fresh out of the mail, if its weird, shake the crap out of it, I mean hard and fast, beat it up, then set it too and dripper top OFF in a dark cool drawer or closet for a few days. Top back on and shake it again every 24 hrs. After 2-3 days try it again. If its still weird repeat.
If its still weird after 2-3 weeks of this you're probably never going to like the juice. Sell or trade it here on the classifieds.
Good luck!