Dolomite Fondo Challenge

Does anyone know if you MUST start at 10:30GMT to qualify? Or can I ride the pretzel route any time on March 25?  

I want to participate, it sounds like fun, but I will not be getting on a bike at 2:30AM (I live in Los Angeles).

Thanks in Advance!

Michael

Here is a link to the event description: http://zwift.com/en/events/view/8523/