Please keep in mind "Burn Times" are not subject to any standards, certifications or verification. It's a marketing tools used by MFG's and if you use it as such you are less likely to be disappointed.
You can do a search on Hearth.com since there are many posts about this. But suffice it to say there are no agreed upon definition for 'burn times'. You would also have to specify a species of wood etc...
Like all manufacturers, we do not design stoves " to blast heat fast, and burn alot of wood."
Some MFG's will list burn times on a 3 Cu Ft at 12, 18 or 20 hours or more (non-cat)
The brands listed above are not likely to have any better or worse burning times as all the non-cats on the market. The best way to find out is asking other users here on Hearth.com for any of the models you are contemplating.
For our part, we'd rather be on the conservative side and post 'burn times' that are reasonable.
Caveat Emptor! Buyer beware...