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My minimum for e-ink would be 6". I suppose that's in part because it's what I have. I've used a DX and I couldn't take that with me as conveniently as my Paperwhite or Voyage. I read on the Nexus 5 with its 4.95" screen and it's small but doable in emergencies. I probably read five minutes on the phone for every two hours of reading on my Kindle. The phone comes out when I'm caught in line or waiting for someone at a store.
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