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    <p>I think you will have better luck with <a href="https://github.com/hadley/lubridate" rel="nofollow">lubridate</a>:</p> <p>From <a href="http://vita.had.co.nz/papers/lubridate.pdf" rel="nofollow">Dates and Times Made Easy with lubridate</a>:</p> <blockquote> <p>5.3. Durations</p> <p>...</p> <p>The length of a duration is invariant to leap years, leap seconds, and daylight savings time because durations are measured in seconds. Hence, durations have consistent lengths and can be easily compared to other durations. Durations are the appropriate object to use when comparing time based attributes, such as speeds, rates, and lifetimes. lubridate uses the difftime class from base R for durations. Additional difftime methods have been created to facilitate this.</p> <p>lubridate uses the difftime class from base R for durations. Additional difftime methods have been created to facilitate this.</p> <p>...</p> <p>Duration objects can be easily created with the helper functions dyears(), dweeks(), ddays(), dhours(), dminutes(), and dseconds(). The d in the title stands for duration and distinguishes these objects from period objects, which are discussed in Section 5.4. Each object creates a duration in seconds using the estimated relationships given above.</p> </blockquote> <p>That said, I haven't (yet) found a function to parse a string into a duration.</p> <hr> <p>You might also take a look at <a href="http://chronic.rubyforge.org/" rel="nofollow">Ruby's Chronic</a> to see how elegant time parsing can be. I haven't found a library like this for R.</p>
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    1. COThese links are useful, thanks. For the moment I'm limited to using base R 2.11. Frustrating, but a constraint I have to live with. Fortunately I don't have a natural language requirement at the moment. I'm interested in trying a project like that in the future though, Chronic may be a useful way to go. [Recorded Future](https://www.recordedfuture.com/this-is-recorded-future/how-recorded-future-works/) is one firm working in this area; interesting to see where you can take it when it works.
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