He never explicitly or implicitly says anything about an increased time or anything about what makes his version "complete" at all.
Oh yeah? Then if the time limit is so much of an issue to you, then why does it explicitly say that his version lasted ten minutes? Hell, Madara's lasted longer since everyone thought him to be dead and didn't expect him to use a transcription seal version of it; the guy also used a shadow clone to pull everything off.
I didn't find this information on the Izanagi page, but I had to go look into the character profile of Obito in order to find out the duration of the completed form of Izanagi.
Obito has a number of Sharingan in his possession which he keeps in storage should he need them. He uses one of these Sharingan to replace the one he gave to Kakashi, although he keeps it covered with his mask most of the time. He later
sacrifices this spare eye's vision in order to perform Izanagi, which allows the user to manipulate events around them. Izanagi ordinarily lasts for only the briefest of moments, but with
his access to Hashirama's DNA he can maintain it for
ten minutes using a single eye. [78]
The time limit above isn't an assumption, but a fact that is easily disregarded these days. Problem is how do you accurately measure out time limits in posts? Or even time for that matter? I brought that issue up with Trev and like you said, we can only go on the assumption that a certain amount of time has passed; it is literally a guess on how much time passed from the last post.
Obito got an arm blown off before he used Izanagi and he can't do one-handed kata. Or it could just be another of many plot-holes in that scene.
Your evidence doesn't exist because we never see what Obito did, it starts to explode then cuts to after the attack is done, we don't know what he did. Senju enhanced Izanagi lets you have it for the entire post instead of just a split-second like regular Izanagi and that is more than enough. If you want to claim otherwise and the judge agrees, that's fine, because I have an Edo Bocchiere with 6 Sharingan in his back so I kinda hope you win the decision so you can deal with 12 rounds of that.
Or maybe Obito didn't expect that much elaborate planning into killing him that it sort of caught him off-guard so much that he had no choice but to sacrifice an eye for Izanagi. Who knows?
We may not necessarily know what happened when everything cut off, but we do know that Izanagi still chains to any damage that would've hit the caster. An entire post? I guess I missed the thread where everyone agreed to a single post per Senju-enhanced Izanagi or was that post limit something that another player went with?
If you want to say that my Izanagi will only work for one post, that is fine with me. It'll give me some more room to work with, since had you agreed to the limit that I put up. I would've been restricted to one new action in the next round, since I would've had Izanagi still active next post and that would've taken a slot out of my actions.
You're in an Amaterasu blanket 10 meters wide so you could Izanagi out of it you'd just have to disappear, reappear 5 meters away, get hit with it again, and then disappear a second time to get out of it.
So if I get hit with Amaterasu while Izanagi is still active, the damage from it will get negated. Any damage will continue to be negated for the duration of the technique being active, so yeah I will get hit twice by Amaterasu and not be harmed by it. Same applies to the other DBZ-esque move that is heading my way, which I stated in my posts would chain to Izanagi and vice-versa.