After reading another chapter about blindness from MS spam I realized...
MS Sasuke went blind after Amaterasu, two partial Susanoo fights and one full susanoo fight. So roughly really fast (Month at most)
MS Madara went blind after maybe a few years (Not sure entirely) but I think this is due to the fact that he ONLY used MS vs Hashirama.
MS itachi had his MS for 8 years but I dont think he needed it much since he has many skills to fall back on much like Madara
MS Obito held his MS for the longest however it was due to his DNA boost. As much as he spammed Kamui I believe he would have went blind REALLY fast maybe even faster than Sasuke
Anyways, I thought it would be pretty cool to mention this just to show how resourceful some uchiha are and how dependent others can be on there eyes
MS Sasuke went blind after Amaterasu, two partial Susanoo fights and one full susanoo fight. So roughly really fast (Month at most)
MS Madara went blind after maybe a few years (Not sure entirely) but I think this is due to the fact that he ONLY used MS vs Hashirama.
MS itachi had his MS for 8 years but I dont think he needed it much since he has many skills to fall back on much like Madara
MS Obito held his MS for the longest however it was due to his DNA boost. As much as he spammed Kamui I believe he would have went blind REALLY fast maybe even faster than Sasuke
Anyways, I thought it would be pretty cool to mention this just to show how resourceful some uchiha are and how dependent others can be on there eyes