בשלמא לבר קפרא – גוזמא
Granted, according to bar Kapara, [the phrase: Up to a hundred, can be understood as] an exaggeration.
The Koren notes
An exaggeration: This term appears in several places in the Talmud. Its basic meaning is that in certain circumstances a Sage was imprecise in his formulation. He did not intend to deviate from the truth. Rather, it was to express the general idea, without concern for its exact parameters. There are also formulaic numbers employed in exaggeration, e.g., thirteen, sixty, one hundred and others (Tosafot): however, the numbers forty and fifty were never employed by the Sages as exaggerations. Therefore, they mst be precise.
We have seen this suggested elsewhere. One common example is the number 600,000 souls at Mount Sinai. Whilst many Rabbis suggest that this was precise, others say it just means “A LOT!”