If you want to know how long does the timer last on snap then you are at the right place. When hourglasses appear on your friend chat then this means that you are going to lose your snapchat streak in a few hours. But there is no time frame that snapchat provides you when you are going to lose your snapchat streak. But some users noted the time of hourglass is 2 to 3 hours and some users noted the timer of last on snap is 7 to 10 hours.