How long does the hourglass last on snapchat?

The hourglass icon on Snapchat indicates that your Snapstreak is about to expire, typically when you haven't sent a Snap to the other person in 24 hours. The hourglass itself doesn't last for a specific duration; it serves as a reminder that you need to send a Snap within that 24-hour window to maintain the streak. If you don’t send a Snap before the timer runs out, the streak will be lost.