Reference for Keritot 37:26

הא מתניתין היא

REMARKED R'JOSE: THEY DID NOT DISPUTE ABOUT WHETHER HE THAT DID WORK AT TWILIGHT WAS EXEMPT, FOR I MAY ASSUME THAT PART OF THE WORK WAS DONE ON THE ONE DAY AND PART ON THE FOLLOWING DAY.<span class="x" onmousemove="('comment',' Viz., each time less than the requisite standard.');">¹¹</span>

Jastrow