Steeping E-liquid actually depends on the flavor. Fruity flavors tend to require the least amount of steeping time. Tobacco flavors need a little bit more time to steep and the more creamier, dessert flavors tend to take the longest time to reach their flavor peak. It is recommended that you steep for at least two weeks, but some flavors may take longer and some may be good right out of the bottle. Using warm water or some kind of heat source such as a slow cooker, some even use their computer’s fan vent will help to speed up the process. The whole point of steeping e-liquid is to get maximum flavor out of the juice, so if it tastes good to you, then you are done. Some people like to steep their juice for 2-3 weeks, while others might even go for months. It is all subjective, so you can steep for as long as you want, but just make sure you are not going past the expiration date on the bottle!
Listed Below The Average Of time required for stepping each kind of liquid
Fruits E-liquid : 2 – 3 days
Creamy , Milky And Desserts E-liquid : 15 – 21 Days
Tobacco E-liquid : 30 – 40 Days
Note : remember this is only an estimation of time required for steeping but actual stepping time may vary depend in your mixing way and E-liquid flavoring ingredients