Commentary for Yoma 163:8
<big><strong>מתני׳</strong></big> עוברה שהריחה מאכילין אותה עד שתשיב נפשה חולה מאכילין אותו ע"פ בקיאין ואם אין שם בקיאין מאכילין אותו על פי עצמו עד שיאמר די
Was it not taught: What is training? If he was accustomed to eat at the second hour [eight o'clock],<span class="x" onmousemove="('comment',' According to the Jewish calculation for ritual purposes, every day, summer and winter, has twelve hours, every night twelve hours. The hours, however, vary in duration. In December an hour may consist of forty minutes, in June of ninety minutes. In Tishri (usually September) an hour would have about sixty minutes. The first hour of the day would be from six to seven, the second from seven to eight. 'At the second hour' would thus correspond to 'about eight o'clock'.');"><sup>8</sup></span> one feeds him now at the third hour [nine o'clock]; if he was accustomed to eat at the third hour, one feeds him now at the fourth.<span class="x" onmousemove="('comment',' This indicates, at any rate, that 'training' means 'training by the extension of hours', not 'fasting to the end of the day'.');"><sup>9</sup></span>