Buongiorno,
anything is possible --- but will it be fun? Personally, I think it would be a bit of a stress test. You need at least a couple of hours to really see and enjoy Pisa and the Square of Miracles.
From Pisa to Cinque Terre in train at least another 1 - 2 hours depending on the connections. So you are limiting your time to truly explore and discover the beauty of CT. You could try mixing a visit to the CT with an organized tour which would perhaps allow you to see more without the hassle of organizing all the logistics on your own: http://www.partner.viator.com/en/835...activities=all
Buon Viaggio,
Donna Denise
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