How big could a moon be before its orbit became too unstable or tidally locked to its planet

How big could a moon be before its orbit became too unstable or tidally locked to a planet about 1.6 times larger than Earth.

Planet BlinketyBlink is on a similar orbit (to that of earth's) around its sun, its landmass is 12% to 80% water and 8% ice.

Alternatively, if the Moon is about 27% the size of Earth, how large would it have to be before it became unstable or tidally locked?

My world is younger than Earth about it's age when Pangea was around, and its moon as well I guess, it doesn't really matter. I just need my planet's atmosphere and weather conditions to be similar to that of Earth's right now, but the moon to not be tidally locked and be larger than ours.

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How big could a moon be before its orbit became too unstable or tidally locked to its planet

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