More Discussions for this daf
1. Miktzas ha'Yom k'Kulo on Shabbos 2. Bris on Yom Tov she'Lo b'Zmano 3. Chametz on the 14th of Nisan, according to Abayei
4. Bedikas Chametz vs. Learning Torah 5. Rashi: Baal Yairaeh and Baal Yimatzeh from Sheish Shaot 6. Difference between two answers
7. Ne'emanus 8. Proof for Zerizus 9. Chezkaso Baduk
10. Burning Chametz On Pesach 11. רש״י ד״ה ואור הנר יפה לבדיקה 12. מקור דין זריזין מקדימין למצוות
13. מקור דין זריזין מקדימין למצוות

Levi asked:

Why don't we say miktzas yom ki'kilo by shabbos or a tannes? For example: If a man keeps shabbos for 5 minutes that should be enough?...or, if he keeps a fast for 5 minutes he should also be enuough..miktzas yom ki'kilo?

Levi, Brooklyn NY

The Kollel replies:

We only apply Miktzas ha'Yom k'Kulo to Halachos which pertain to a day; not to Halachos that apply to a particular day. The logic for this is obvious: after the Miktzas ha'Yom passes, even if it is considered as though you have kept a full day of Shabbos, nevertheless the remaining part of the day is still Shabbos.

D. Zupnik