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I checked other series with rape in it to see if there's a warning and I only found one series: "An Easy Target". But An Easy Target is nothing more than rape and only 3 chapters have the graphic content warning, so it's not like they give something away with it.
I'm really pissed right now. The last chapter wasn't exciting at all for me because I knew what was going to happen because of this god damn warning.

It was 2 months but back then KS wasn't released simultaneously in every language ( in the Korean version it was a 2.5 months break). She also had to delay the second season because Lezhin decided to release the new chapters simultaneously and she needed more time to prepare proper scripts for that. So it could be possible that we only have to wait 1-1.5 months but I think we'll have to wait at least 2 months again.

I don't have a problem with the content warnings. It doesn't hurt anybody to put those. Some chapters are darker than others, and some people who like the series could get really upset over it. So they can just skip that particular chapter all together.

Personally, I believe that if you're going to skip chapters or episodes, you needn't bother starting the series at all. If there are warnings, it should only be in the synopsis that tells you about the series before you read it. People also really need to learn to read tags. The tags at Baka Updates Manga are way more accurate than here though.
Spoilers ahead
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Why did they have to put "WARNING: GRAPHIC CONTENT" in the caption for episode 35? After episode 26 we all know what that means. They only do it when there's rape in it.
They basically tell you what is going to happen before you even read the episode.
I wish they would stop doing this and just warn the readers in the editor's comment that there's rape in this series. This stupid warning ruined this season's finale for me (╬ ̄皿 ̄)凸.