Justification for AC?

[RTGoodman]

Maybe he's working under the assumption that each TURN is 6 seconds, rather than each ROUND?

EDIT: Too many people at once!

Ahem, I'm trying to remember the 3.5 rules from my very hazy memory. Isn't a full round (about) two minutes? Which means if you have a full-round attack action, you're fighting for two minutes.

The timespan might be different. But it's in there somewhere, I swear.

No, a round is actually only 6 seconds, and everyone's turn happens in that 6 seconds. At least, that's the norm for 3.x and 4E D&D.