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Question:
How many characters can be typed into a memo field?

Answer:
By product design, a memo field is a text field that can hold text with up to 64 KB of storage capacity. The exact capacity depends on the database used.

KBA is applicable for both Cloud and On-premise Organizations 
This article is valid for DocuWare versions: 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9 | Memo Field; Index Field;