I use this whistle when I work. This whistle stays in my mouth for long periods of time as I chew it and can stay completely submerged in water while I work. Yes, I'm a lifeguard. This whistle being used three times a week for over 4 hours I would say can last easily a year (and that's from constant use). This whistle is very loud, your ears will ring if you blow it at full capacity without ear protection and it's very lightweight.