I'd say it would be fine. i went away for a few days when DD was still BF as a young toddler and we started back up with no problems. i guess if you do feel concerned bring a small handpump and do a pump and dump once a day...(i have done that when i was studying and couldnt get away in time...but DD was a little baby at that time so supply was crucial ITMS).

also i guess that when you get home get him to have a couple of extra 'welcome home' feeds

fenugreek tea also helps supply...