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CYOA
Just under 100cm (70^2 = 4900, so you're looking at sqrt(9800) which is just under 100).
Plus you've got to take into account the depth of the table top which will reduce the width that you can get through it as you can't go exactly from corner to corner.
Even then there might not be enough space to get the table top through vertically without twisting it, which will require even more leeway.
A ~10cm inverse shim on the inside of the loft hatch should be enough though.