Original Comment:
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This recipe can also be made without Bilberry (FA) and it also tastes pretty good.
Steeping: I'd say a day or two, but as per my taste, this can also be used as a shake and vape liquid.
NOTE: I like my nicotine levels low (currently at 1.5mg/ml or max 3mg/ml), so feel free to adjust it to your own liking. I also use small 10ml nicotine booster bottles with 20mg/ml 50PG/50VG, so again - adjust it to what you use.