Which blat Gemara (Bavli, Vilna edition) has the largest quantity of Talmudic text or the most complex and difficult to understand concepts?
closed as not constructive by yoel, Monica Cellio♦ Sep 3 '12 at 20:41
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If you're just looking for long talmudic text, there are others in Brakhot with little commentary: See Brakhot 56b, 58.
Difficult sugyas with little Talmudic text and plentiful Tosafot/Rashi are qualitatively longer (and scarier!) than the more aggadic, pshat texts. There are a few in Niddah that make you hold your breath when you first turn the page onto them: See Niddah 10a, 18, 67a.
The longest battle, imho, are the four days studying masekhet kinim.