Commentary for Arakhin 15:11

יתר על חמשים הוא דליכא הא פחות מחמשים איכא וסתמא כרבנן:

[if she says,] 'I saw uncleanness for three days', her re-count commences after seventeen days.<span class="x" onmousemove="('comment',' If all the three days were part of the zibah period, then the niddah period would commence no later than eight days after that, the assumption throughout being that there was no flow whatsoever during these seventeen days. If all of the three days fell into the niddah period, then the new period of niddah would commence after fifteen days, i.e., after the last four days of the niddah period, and the following eleven of the zibah period. But since it is also possible that the first two of the three days of the flow were the last days of the zibah period, and that consequently the niddah period would commence only with the third, six more days of the niddah period followed by eleven days of the zibah period must pass before the woman can re-commence her new niddah period, hence again the necessity of seventeen clean days before she can definitely re-commence her reckoning.');">⁶</span>

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