It’s empty in here!
We have a Staffy/whippet cross who has been chewing on one of these for about 20 minutes. He has already made serious dents in it and the whole thing keeps disappearing into his gob. He's *really* enjoying it, but I can already tell that I'll end up having to save him from himself so he doesn't choke or get sick. Our fellah is particularly destructive though - his goal in life is to make anything remotely edible almost small enough to swallow and then to try anyway.
I give to my collie and each hoof lasts a week of regular chewing. The very odd hoof she shows little interest in (i guess less flavoursome than others?) so i stuff those with some peanut butter/mushed up baby food/meat puree and she spends ages licking and chewing them. One bag lasts us a few months.