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Based on my experience, it's about half the time. I might be wrong, but... Seriously. The hit/miss statistics usually reflect this:
1st attack: Miss. After that, it's possible to hit or miss.
2. If it's a miss, there are two guaranteed hits afterward (probably a quirk of the game's randomizer, because theoretically, it shouldn't be like that).
If it's a hit, we go back to point 1.
If it starts with a hit, everything resets.
This pattern has worked, if not always, then almost always, in my experience.
1st attack: Miss. After that, it's possible to hit or miss.
2. If it's a miss, there are two guaranteed hits afterward (probably a quirk of the game's randomizer, because theoretically, it shouldn't be like that).
If it's a hit, we go back to point 1.
If it starts with a hit, everything resets.
This pattern has worked, if not always, then almost always, in my experience.