Speed / Time Challenge Feature

[MasoLinguist]

@Christoph-Meyer - according to our talk in Munich CCDays.

As a new challenge for the players I would suggest a feature that could be played if there is not enough time (or mood ;-) ) to start a big quest.
E.g. kill as much bugs or code smells in a certain time period, or, kill a certain amount of bugs and stop the time.