Remember what I told you about katsuyu continously injecting chakra to oro and jiraiya? well that's how they will break out from genjutsu. Remember that while a normal genjutsu is going on, both bodies are most likely not moving, as proven when itachi did Tsukuyomi on Sasuke, and when Itachi trapped naruto, sakura, kakashi, chiyo with finger genjutsu, HE COULD HAVE ATTACKED, but why he didn't? So we can practically infer that the targets and the user can't move..... According to this, Finger genjutsu or normal genjutsu takes longer than Tsukuyomi, because it is not instant.
Sasuke will definitely use kirin when he's out of chakra...... Check out the fight and you will see that in a moment of the fight he or someone else stated he was already out of chakra.
I NEVER SAID ANYTHING ABOUT CHOU OODAMA RASENGAN....... How about we put it more simple? Dark Swamp jutsu for Uchiha bros and they are done for? see how simple things can be? I don't see a reason for chou oodama Rasengan to be used, when you have jutsus like, Dark Swamp, Edo tensei, A Katsuyu that can throw acid and melt susanoo's bones =/ =/
Susanoo is not instant...... Remember first it needs to get the bones, then it needs to get the flesh and then the armor that comes with the holy items =)
And true, having tons of chakra doesn't mean you win the fight, BUT IF YOU MANAGE TO ENDURE THE WHOLE FIGHT UNTIL YOUR OPONENTS RUN OUT OF IF. It can be considered and instant win. And if you add to it the fact of the endurance in fight, THAT WOULD BE KILL