Long Notes or
LNs for short, are a type of notes found in VSRGs (Vertical Scrolling Rhythm Games) and require player to hold the key until the note ends.
Different games implement LNs differently, for example: In the game Osu!mania (a gamemode in the game Osu!), The player is required to release the end of the note at a certain point called "Slider End", and game
Clone hero doesn't require the player to release the key at any particular timing, hence,
long notes is
Clone Hero do not have a Slider End