I have 5 numbers pin and it works in Italy
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I use 6 in Italy no problem...
you have to digit the right number your card requires and you'll have no problems.
I got debit card with 5 digits, Amex with 4 and an other card with 6. AFAIK there's not a limit, the whole digits would be processed
this anywhere in the world
if it happens with AMEX I digit 4 number right and then a fifth number, the POS says it's a wrong pin.
My PIN is 6 numbers and it works just fine.