I heard this sentence. 仕事はひまでしたが、うちでよるいちいちまでレポートを書いています。
I looked up いちいち and it could mean
separately. I'm guessing this in sentence it's saying 11. However, I'm wondering if いちいち normal for saying 11.
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You got it wrong. Even if it meant
11, I would then ask you "11 what?".
11まで does not mean much.
I have not met any cases where it means
11. If I check it out, there is nothing about it.