You can never expect the full five to come back around, because people will lose track of who bought what (acceptable -- they are drinking), and other people will use their entire time plotting to avoid buying a bucket through various means (not having cash, "getting you back later, brah," simply waiting and waiting until someone else does even if it's technically their turn) and will succeed. But that's the way the world works. These people will likely be horrendous company in many other ways as well. With any luck, they had shots at brunch and are about to get Ronnie Lotted.
But for you, sit back and enjoy the relatively daytime emptiness, the random small-conference college sports on the TVs, the downtrodden regulars for whom Day Drinking is a depressing life fact (and not an enjoyable activity you read helpful guides about), and not-quite-ironically playing the Len song "Steal My Sunshine" on the internet-connected jukebox. Once the rotation, however incomplete, swings back and eyes turn to you to buy another bucket, it's time to go.