Originally Posted by
abmj-jr
I definitely do not think the bath is worth deliberately missing your flight and taking another 6 hours later.
I agree, 4 hours would be perfect for what you want to do, but three hours is enough time... just.
The shops near the sento on the 4th floor look like
this and
this (lots were closed at 8am), that's probably the main attraction aside from the baths.