- General Questions on Brachot
How much time must elapse for you to have to make another Bracha on a drink you already made a Bracha on?
As long as there's no Hessech Daat, ie. you are still with your mind on your drinking, you don't have to say another Bracha. For the last Bracha (Bracha Acharona) it's usually 72 minutes. (MB 184;17)