Another one of those no experiance things But, if you leave a hive queenless for 24 hours (or however long you do, 5 or 6 for me) before installing new queen I'd THINK 24 hours in th OB hive might be pushing it. If it were me, I'd have everything loaded in the car and ready to go, THEN pull the queen and put her in the OB hive, do the presentation, then but her back into her hive before unloading anthing out of the car. No sense keeping her out longer than necessary. Remember to cover the OB hive on the way to and from presentation so as not to cook her. For what it's worth, Ted