
This is not exactly all attempts, but maybe the amount of actual attempts is closer to 4000? I did die before the second photo in most attempts I think.
In Impossible Spell Card, I have 3856 attempts at 6-7.
5850 photos on Iku's star spell card in Double Spoiler, counting both Aya and Hatate. Then I also started on a fresh score dat a few times here and some other cards also had high numbers, such as 9-7 (a bit over 4000) that might be a strong contender for real highest attempt count in Double Spoiler. I also attempted 11-4 a lot, but mostly tried to time it down, so not much of a record was kept of that.
Then I have some on Mononobe's Eighty Sake Cups Lunatic: 2351 attempts.
Then there's Sirius "High-Speed Pounce" Lunatic: 2250 attempts across all shottypes.
Another big one is Social Upheaval Requiem on Lunatic: 2235 total attempts across shottypes.
Probably have some high numbers in SA or MoF as well, can't think of anything that would really contend with these right now though.
Let's take a trip down memory lane
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