This review is provided solely as a counter to an incorrect review of this module as a "squatter". It's nothing of the kind, it does actually implement what it says it implements, and seems to do it well.
I honestly do not think this module is CPAN pollution at all, and give it five stars to outweigh the bad rating of cnlschwartz (which is one of many 1-star ratings with exactly the same text "useless CPAN squattering").
Namespace is well chosen. Interface is simple (though it might have been better to return the value in seconds). I like that it tries different methods of obtaining an accurate value.