You tell us O.o
Yeah. It is. Just checked. 
The math looks like it takes exactly 7 days to lesson → guru all radicals and then all kanji locked by radicals. When you say less than 7 days, are you talking about the levels that you can get passed without guruing radical-locked kanji?
The final day isn’t treated as a 24 hours.
1 day is 23 hours.
2 days is 47 hours.
1 month is 29 days and 23 hours.
And so on.
Therefore when you have to guru 2 sets of kanji it is 3 days and 10 hours per guru. Hence 6 days 20 hours for shortest. Although it seems you might be able to go slightly faster with the newest update to the times.
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You didn’t subtract an hour from the items 1 day or longer 
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Ahh, gotcha.
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