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Anything 2:50:00 or below is 100% and anything 2:55:00 and above is 0%

Is this actually accurate or did I find a bug?

If not, such a weird 5 minute window

The 0% above 2:55 makes sense at least since it's the BAA's new cutoff this year for males <35yo (the default on the calculator):https://www.baa.org/races/boston-marathon/qualify

But that's for 2026 - the 2025 time qualifying time is 3:00.