Another Repeat

In some yeshivos and shuls there is a custom that certain kibbudim on Simchas Torah are sold not for money, but rather for commitments to learn Torah. In one yeshiva, a bachur won the bidding by committing to learn 1,000 blatt Gemara. Rav Yitzchok Zilberstein discusses the following question: Is the bachur obligated to learn 1,000 unique pages of Gemara, or can he review 200 pages five times each?
Rav Zilberstein suggested that perhaps an answer can be gleaned from a daf in Megillah (23a–b). The Gemara says that the haftarah that is read every week must contain a minimum of 21 pesukim. Rava challenged this ruling by noting that the haftarah for Parashas Tzav contains less than 21 pesukim, whereupon the Gemara qualified the original ruling: One can read less than 21 pesukim if he reads through an entire topic. The congregation is not obligated to start a new topic in Navi to meet the 21-verse requirement.
Rav Shmuel Bar Abba further challenged the 21-verse ruling. He said that many times he read the haftarah in front of the eminent Amora Rebbe Yochanan. On those occasions, Rebbe Yochanan instructed him to stop reading the haftarah after he had read 10 verses, even though he was still in the middle of a topic. It would seem that Rebbe Yochanan does not agree with the 21-verse haftarah requirement. The Gemara concludes that even Rebbe Yochanan agrees that in some instances 21 verses are required. However, where there is a translator, 10 verses suffice.