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It's about a certain main character who is a human and gets summoned in another world but after 60 seconds he's suddenly in front of goddess-sama again and he gets summoned again by the demons and like his first summons he is suddenly in front of goddess-sama again. In his 3rd summons he is being experimented and he came back in front of goddess-sama and in his 4th summons he met a dying girl who has wishes but he said he wouldn't last longer than a minute so the girl is devastated. So in his 5th summons he became a demon lord, after he came back in front of goddess-sama, she said that she found the problem and fixed it so in his 6th summons is a complete (so every time he gets summoned he acquired a certain power/blessings).

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As per Valorum's comment, I believe this is I Was Summoned to a Parallel Fantasy World for Too Many Times (original title Meccha Shoukan Sareta Ken or めっちゃ召喚された件 ~世界法則無視のチート権化~)

Front cover of Meccha Shoukan Sareta Ken

A boy’s whole class gets summoned to another world, except he’s the only [one who] was transferred to a different one. Just when he gets used to his new life, he gets summoned to another world again, and again.

I poked around and found a scan of it and indeed, one of his early misadventures involves the magic eye researcher going after his eyes.

Magic eye researcher explaining his plan to harvest magic eyes

Found by searching for isekai manga summoned repeatedly, which brought me to this listing with Google having shown an excerpt mentioning the promising title of I Was Summoned to a Parallel Fantasy World for Too Many Times which I then followed up on.

Answer colored over from where I provided it here.

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