Why 10675199.02:48:05.4775807 TimeSpan Maximum for CompilationSection?

Question

I was looking at the metadata for System.Web.Configuration.CompilationSection, and noticed the following attribute on the TimeSpan BatchTimeout property:

[TimeSpanValidator(MinValueString = "00:00:00", 
 MaxValueString = "10675199.02:48:05.4775807")]

Could someone explain why this is the allowed max value? TimeSpan itself has an upper limit, so why would there be another value validation, and why this number?

Answer 1

That is exactly the maximum value of TimeSpan. Quoting MSDN for TimeSpan.MaxValue:

The value of this field is equivalent to Int64.MaxValue ticks. The string representation of this value is positive 10675199.02:48:05.4775807.

Answer 2

I think the accepted answer does not fully answer the question. It is indeed the same maximal value. And it's no coincidence. But why is the definition:

[TimeSpanValidator(MinValueString = "00:00:00", MaxValueString = "10675199.02:48:05.4775807")]

and not something like:

[TimeSpanValidator(TimeSpan.Zero, TimeSpan.MaxValue)]

?

Well simply put, it's because Attributes don't allow the second kind of definitions. They only allow compile time constants, because they are meta data that's compiled into the assembly.