Batman likes the 12″ thick bully sticks (pictured below). I prefer the odor-free ones. They last about an hour if he’s really dedicated to chewing. When Batty was teething (4-5 months old), they lasted for 3-4 hours and saved my ankles! We’ve tried the braided version and they’re nice, but not worth the extra money.
He’s also crazy for the trachea tubes, but be forewarned, they reek! They also don’t last as long as the bully sticks, maybe 15-20 minutes for Batman at 10 months old. These are good for distracting him while I file his nails or clean his ears.
Another great product is the knuckle bone. These take Batty a few hours to chew all the meat off of, and then he will randomly scrape the knuckle down for a few more days. I throw them away if they get too small, or within a week or two after opening.