Hey! There’s no minimum play time required at all.
The whole point of this jam is to make something small, weird, experimental, or unfinished-but-fun. A 2–5 minute game is totally fine if it fits the theme and feels complete enough to play.
Since the jam is short, I’d recommend focusing on one strong idea or one funny mechanic instead of trying to make something big.
So yes, you’re very welcome to participate!