If you leave it in the primary til you get back it will be fine, it will be nice and crystal clear, I leave mine in primary for a month now, and they are excellent, becasue the yeasts clean up after themselves...
BUT another thing you could consider doing is, if around the 18th or 19th, hydro reading are consistant for 3 days, and fermentation is complete, then I'd go ahead and bottle and put it away...that way you will have it bottle conditioned and carbed when you get back.
That way you'll haven early 14 days on the yeast (if you bottle on the 19th or 2th) then a month bottle conditioning...That will make for a nice beer... (But only do that if fermentation is complete on the 18th/19th) otherwise just leave it alone (unless you spring for a secondary, then rack it on the 18th)..
But me? I'd bottle before you leave, so you have a nice homecoming present.
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