"Is it unusual for orienting to occur late in the afternoon? For example 5:12 pm EDST?"
lastfling.........welcome and like lee said, not unusual........
"I would post a video but don't know how lol."
take your video and upload to you tube. to post here, once uploaded to you tube, copy the url and paste the you tube link in the body of your reply.
"Best I can tell, there's not a lot of fighting, but there are a lot of bees flying facing the hive. I might. Need to retract as the numbers have dimished considerably since o started typing this"
if there is not a lot of fighting, and bees are flying facing the hive and numbers have diminished........my guess is orientation.
lee has some great points on robbing and flying behavior, once robbers start they don't quit until the hive is decimated. also, if you see bits of wax on the landing board or out the front door of the hive, then the hive has certainly been robbed.
"And they have gone through nearly two gallons in 2 1/2 days. The horizontal hive has a frame feeder and they have done nearly the same."
2 gallons of sugar syrup is a lot of feed to go through in 2 1/2 days, i would be checking the hive/s..