Who knows fifty-five?
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55 are the years that King Menashe of Judah ruled. (II Kings 21:1)
Correspondingly, 55 are the number of approaches he was able to use to explain the Book of Vayikra (Sanhedrin 103b).
An outstanding Torah scholar (see also ibid. 102b), he was nevertheless one of the most wicked Jewish kings (at least until he did teshuvah); according to the majority opinion (ibid. 90a), he lost his share in the World to Come for his actions.
55 days from the original shabbos hagadol (10 Nissan) until kabbalas haTorah (assuming 6 Sivan).