Master password: how many Diceware words?

I know this is another stupid newbie question. And the answer is almost assuredly "opinions differ about that." But I'm wondering what the AgileBits party line is regarding Diceware master passphrase length. I seem to remember seeing that Arnold Reinhold himself is telling folks to use 6 words... so is that what most people use? I can type fast on a keyboard, so even 7 is fine. But on an iPhone keypad... let's just say I don't want to make it longer than it needs to be. What is the general advice given? Would 5 normally be considered strong enough? 6? I think about how many other passwords etc are stored in the app, and lean toward 7.

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