And then a single page after that he shit himself and went blind [
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]. Sasuke's eyes couldn't keep the Susano'o up for more than a second simply because his eyes weren't as strong as Itachi's.
And no, Sasuke doesn't have more chakra and or stamina than Itachi, not by a long shot. Sasuke, who possessed Orochimaru's cells in addition to CM2 (which exponentially increases one's chakra and stamina reserves) ran out of chakra before Itachi did [
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]. After Sasuke ran out of chakra Itachi could still use a complete Susano'o even WHILE blind, something Sasuke couldn't even do as proved above [
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]. MS Sasuke does not possess CM2, therefore his chakra and stamina is lower than it was during his battle with Itachi, a battle where he ran out of chakra and stamina before Itachi did, meaning that however long MS Sasuke used his MS eyes for, Itachi can do it even longer.