TimeSpam is missing the "total" properties

[josesimoes]

The .NET struct has these properties which are very convenient for use cases where you want to subtract two DateTime and have the total time that an operation took, for example.

TotalDays
TotalHours
TotalMinutes
TotalSeconds
TotalMilliseconds

As all of them are based in the already existing ticks value that represents the TimeSpan, there is no severe penalty on adding these which are calculated only when, and if, called.