You can vape most of the Hangsen tobacs within a week but I let mine sit at least 3 weeks. The 7leaves is another at least 3 weeks to steep. I haven't really dwelled past the hangsen tobaccos into other companies but the few INW tobacco and absolutes I've tried need several weeks to mature. I don't heat steep nothing but do "seed" a new mix, thats putting some already steeped juice into a new mix of the same juice. I do @10% seed and that helps speed up steep time some but I have enough backstock I usually don't get to my new tobac mixes for well over a month.