Arba'a Vachamishim Umatayim - mi yodeya?

Question

Who knows two hundred fifty-four?

Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:

• Upvote all interesting and relevant answers.

• Accept the what I think is the "best" answer.

• Move on to the next number.

Answer 1

254 men appeared before Moshe during Korach's rebellion:

Korach, Dasan, Aviram, On and 250 prominent men. (Korach 16:1-2)

וַיִּקַּח קֹרַח, בֶּן-יִצְהָר בֶּן-קְהָת בֶּן-לֵוִי; וְדָתָן וַאֲבִירָם בְּנֵי אֱלִיאָב, וְאוֹן בֶּן-פֶּלֶת--בְּנֵי רְאוּבֵן. וַיָּקֻמוּ לִפְנֵי מֹשֶׁה, וַאֲנָשִׁים מִבְּנֵי-יִשְׂרָאֵל חֲמִשִּׁים וּמָאתָיִם, נְשִׂיאֵי עֵדָה קְרִאֵי מוֹעֵד, אַנְשֵׁי-שֵׁם

Answer 2

According to the Jäger Report (and as cited by Martin Gilbert), 254 Jewish men were killed by the Nazis' Einsatzkommando 3 and its helpers in Ukmergė on August 1, 1941.

Answer 3

Lag baomer is the 254th day of a leap year in which Kislev has but 29 days.

Answer 4

254 years after Yishmael's birth, Yaakov "should" have died (at 180).