My daughter's comfortable with reading letter-sized pages with 12-pt font on a 6" Kindle screen. I can if I use the landscape view; I get more annoyed with the page breaks than the font size.
That's small enough that you really should find someone with a device to check it out; the line between "a little small, but I can put up with it" and "too small to read for more than a minute or two" is very much a matter of personal preference.
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