Buying timed tickets well in advance to climb the Leaning Tower is advised. RS Florence & Tuscany book says they go on sale 20 days in advance. They actually go on sale online 90 days in advance: https://www.opapisa.it/en/tickets/buy/.
I purchased mine today for May 15, 50 days in advance. Note that you should be able access the ticket web site with any browser, but actually buying the tickets will not work with Firefox. I was successful with Chrome.
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