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Oh I get it. I think most people aren't counting all 24 hours when they say "most of the day". At least I know I'm not, and (as I stated above) it takes me about 5 hours to brew, and I definitely consider that "most of the day".
To me, "the day" would be usable waking daylight hours, which for me would be 10am - 6pm. That's 8 hours, meaning 5 hours for brewing is "most" of it.
So if I plan to brew on a weekend day as many of us do, I pretty much can rule out being able to get anything else done during that day. If I start at 11am, and finish around 4pm, that only leave a couple of hours of daylight for other chores - i.e. not much of the day left. Now the night is a different story, but it's not like I'm going to mow the lawn in the dark haha!!!