I'm with Micheal. Had a discussion w/ my bud about that, his therory is they don't lose their orientation within a certain time frame, just location, so I tested a hive when I knew the weather was going to be snotty & cold for a week and turned them 90 degrees.
It was a good 8 days before they could fly again and there were quite a few bees still heading for the side of the hive and then working their way around. On a cold sunny day they might not have had the time to get it right.
Or maybe I got dumb bees? :-D