Should last you unopened (un-used) four or five weeks
Option:
Use Coffee Grounds instead of brewed coffee
Add all ingredients
shake well and store in a cool place or fridge.
Shake every few days while resting 15 days.
Filter into another Mason Jar. Enjoy
Notes
To brew coffee to a thicker consistency, simply increase the amount of coffee grounds you use relative to the amount of water; this is essentially adjusting the coffee-to-water ratio to a higher proportion of coffee grounds, resulting in a more concentrated and fuller-bodied brew.