Using Javacript to track time

I want to use java script to track when a page loads and then after 28 mins. do something. How reliable would using JS be? Any issues I need to lookout for? Any suggestions?
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It works fine.  Use setTimeout.  I use repeating timeouts of half an hour or more all the time.  Of course, the page must remain loaded the whole time.  

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894359Author Commented:
I was using that but found it super quirky on servers. Locally it ran fine but when on a web server it seemed to sped up significantly.

Are you talking about Server-Side javascript?  If so, you are right - Server Side javascript setTimeout does not appear to be reliable.  I thought you were talking about typical client-side javascript.
894359Author Commented:
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