Who knows fifty-four?
Please cite/link your sources, if possible. At some point in the next few days, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
$54 is "triple chai." Due to inflation, people have been saying that a "chai" donation ($18) isn't what it used to be; in some shuls, you tend to hear more pledges for double or triple chai, or "chayim" ($68). Or at least that was back before the current economic downturn, so never mind ...
54 are the years that the Jewish People studied the laws of Terumah and Maaser before actually being able to put them into practice. (Kiddushin 40b)