This has been such an issue with some of our seasonal hires this year. Granted, when you're new, it takes awhile before you can get every batch done in 30 minutes (especially when items are flexed and truck isn't pushed and your ETLs are harping about INFs). But it should not take an hour.
Most of it comes down to training. Our leadership's philosophy is always "Oh, you have 4 new TMs starting today? Good, show them how to do one cart and then you have 4 extra people to do OPUs." One cart = fully trained. This is the philosophy year-round, whether or not it is Q4. Drives me insane.