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Happy days.Shouldn't be an issue, unless of course you are not running any sort of medication cycle on it and presuming your tank and filter are both healthy and working correctly. In the 12 months my tank has been set-up the longest i have gone without a water change at all is about 18 days (whilst i was in hospital) and it didn't do my tank any harm what-so-ever.
Maybe do a nice, big, deep clean just before you go away..maybe 50/60/70% water change.
Terry.