The primary purpose of this TimeSpan parsing class is to provide more reasonable and logical behavior when parsing a string. Unfortunately, TimeSpan.Parse expects values to be within the exact range for hours (0-23), minutes (0-59), and seconds (0-59) and failure to do so results in odd behavior. For example: 24:00 is not treated as 24 hours (because it is not in the valid range of hours), and instead of throwing an exception, it treats it like 24 days. What?!? This class acts more like microwave time. That is, if you say 90 minutes, it knows that means 1 hour + 30 minutes. It still uses the (arguably non-standard) TimeSpan string syntax for compatibility with the TimeSpan.Parse method. For the most part, this class attempts to be compatible (a drop-in replacement) for TimeSpan.Parse(string). It maintains the contract of throwing appropriate exceptions for null, empty, or unparseable strings.

Reference

TimeSpanAsString Members
Miner.Responder.WindowsService.Settings Namespace