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9:29 PM
Odds of a Critical Success with Advantage, or a Critical Failure with Disadvantage, using the following homebrew rule:

- Critical Success occurs when a roll has advantage, one of the dice is a natural 20, and the other die is high enough (with modifiers) to pass the check
- Critical Failure occurs when a roll has disadvantage, one of the dice is a natural 1, and the other die is low enough (after modifiers) to fail the check

DC is what the die needs to roll to succeed on the check, before modifiers.
╔═══════╤════════════════════╤════════════════════╗
║  Name │ Critical Success % │ Critical Failure % ║
╟───────┼────────────────────┼────────────────────╢
║  DC 0 │              9.750 │              0.000 ║
║  DC 1 │              9.750 │              0.000 ║
║  DC 2 │              9.250 │              0.250 ║
║  DC 3 │              8.750 │              0.750 ║
║  DC 4 │              8.250 │              1.250 ║
║  DC 5 │              7.750 │              1.750 ║
║  DC 6 │              7.250 │              2.250 ║
 

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