I'm honestly not familiar with how a cat burns on high burn. Do you open the air? Is that what you mean by WFO? (I know the acronym). I burn my tube stove the same way whether I'm going for a four hour burn or 12 hour burn. The only variable is the load size. The air setting (low) is the same once I'm at secondary burn operating temps.
Yes, by WFO I mean WFO the BK has a thermostatically controled draft and doesn't require the same amount of air to keep the cat active on a low burn as a tube stove would require to light off the secondaries.
The up side to the BK. Probably most cat stoves but I use BK as an example because that's the only one I have first hand knowledge of, is that it can be ran very low (30 hours on a full load in the 2.85cf Princess, and yes that is my experience) to any reasonable high temp a tube stove can be ran at and all points in between.
When shooting for tube stove heat I load as often as you would a tube stove but the long, even heat has sufficed the majority of the time here in WV.