Hi, @Francios De Stadler !
Welcome to the Community!
From the documentation looks like 4500 cards is recommended:
Trello limits the number of objects (cards, checklists, stickers, etc.) that can exist on a board or card. The limits for each type of object and whether they are limited at the card or board level are available via the cards and boards API resources.
Your Limits May Vary
The responses below and the limits they contain are not meant to be the documented limits - they are only examples of the type and shape of response you can expect to receive back.
Limits may vary by boards and accounts. You should adjust your application to handle the responses and their values appropriately.
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