I store shifts to events with a TimeSpan as the offset from the start of the event and another TimeSpan as the duration of the shift. The setup shift starts before the event (so everyone see the event as 11:00am – 4:00pm as desired while the setup shift starts at 10:15am).

Entity Framework throws an exception saving a TimeSpan < 0 or >= 24:00:00. Is there a way to save a TimeSpan outside the 0 .. 24 hour range?