Async/await in azure worker role causing the role to recycle

I am playing around with Tasks, Async and await in my WorkerRole (RoleEntryPoint).

I had some unexplained recycles and i have found out now that if something is running to long in a await call, the role recycles. To reproduce it, just do a await Task.Delay(60000) in the Run method.

Anyone who can explain to me why?