It depends on the brand sunsweet prune juice has 180 calories.
6-8 lemons = 1 cup
The answer here is valid for the USA / USA measurements. Two tablespoons = 1/8 cup = traditional "scoop of coffee" for brewing one cup. Therefore, 16 US tablespoons = 1 US cup.
around 16 level tablespoons
There are 16 tablespoons in a cup, so a tablespoon is about 1/16 cup. Two tablespoons to the ounce, eight ounces to the cup.