Commentary for Berakhot 6:16
רב אשי אמר משמרה ופלגא נמי משמרות קרו להו:
Rab Ashe said: A watch and a half are also referred to as "watches."
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
This is an alternative answer to uphold R. Nathan's view. By "watches" is not necessarily to be understood two complete periods of time.
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