Math Speculations Before Planck Epoch: Estimate of Time?

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Granted, physicists acknowledge that we have no basis for speculating what the universe was like before the Planck Epoch. However, have mathematicians tried extrapolating pre-Planck Era conditions from the values after 10^-43 second? Is there an estimate of how much time passed between Time 0 and 10^-43 second? Thank you for any information you can offer.
 
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We do not encourage speculation here.

Also, the time that passes from t1 to t2 is simply t2-t1.
 

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