"It takes two days."
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I think your Japanese friend might have been trying to make the exact opposite point: that ついたち is the only one not used for it. ^^
ついたち has a meaning more like "beginning of the month". It doesn't have anything to do with number, so therefore isn't all that handy for durations.
For durations of days, my understanding is that it goes いちにち, ふつか, みっか, よっか, いつか, むいか, なのか, ようか, ここのか, とおか.