How about a marathon mode? You know it just picks random songs continuously until you stop. There could be highscores for it.
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Marathon Mode [Dupe] [duplicate]
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Osu! Fact #006485: Any map over 5 minutes will most certainly not get ranked. This being said, you can deduct rather easily that a feature such as this will, likewise, most certainly not be added. 
Personally though, however useless it may be, I vote yes for this.
Personally though, however useless it may be, I vote yes for this.