Is anyone really suggesting AJ and his minders could not have predicted they were up for it big time? If not, they were the only ones in the room.
The only reason he had a plane to catch was so that he could get out of that room and hope they didn't call him back. Thankfully the senators were well onto him and indicated that they would extend a further invitation for another day.
I also don't believe that any of the other scheduled witnesses would have minded a bit being delayed or being called back, as they observed the rightful grilling that the Rat was getting and may it last a little while longer yet.
I would even think that some of his managers would cover for him at work when required so they didn't have to explain their own actions on many fronts.