The maximum is 60 in the main deck.
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You may have up to three in your main deck and side deck combined.
A Yu-Gi-Oh deck may consist of 40-60 cards. You are also allowed 15 cards in a side deck. Along with these rules you may also have a side deck of 15 cards that consists of only synchro monsters and fusion monsters.
Well, the minimum in a yugioh deck is 40 cards maximum 80cards. Most people try to have a smaller deck over a larger deck, to get cards they need. About a 40-50 card deck is good.
You can have three Dian Keto in your main deck and side deck combined.