Reference for Berakhot 51:12
תפלת הערב אין לה קבע ושל מוספים כל היום (ר' יהודה אומר עד ז' שעות):
As far the Tefillah of the evening, it has no fixed time. The additional Tefillah [may be said] at any time in the day. R. Judah says : Until the seventh hour.
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