How long would a day be on two tidally locked earth sized habitable planets?

So for my story I want to have a binary planetary system, where both planets are about the size of earth and are habitable by human people. I'm also thinking that they will be tidally locked to each other, which means their day will be the same amount of time it takes for them to orbit around their common center of gravity, about half way between the planets.

So my question is, how fast could they be going without going too fast where they would lose their stable circular orbit. I'm just trying to figure out what would be a reasonable length of a day in this situation.

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How long would a day be on two tidally locked earth sized habitable planets?

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