Snapchat hourglass time lasts for 60 minutes, which is the amount of time allotted for a Snapstreak. A Snapstreak is achieved when two people send snaps to each other consecutively for at least three days straight. The hourglass icon is used as a warning that the streak is about to end, and it indicates that the user needs to send a snap to their streak partner to keep the streak going. If the streak ends, the hourglass disappears, and the user will have to start a new streak with that friend. So, keeping a Snapstreak alive requires active participation from both parties within the 24-hour window.