Memory String Tag and Text Area (maximum number of characters/size of string)

[JordanCClark]

Text datatype for tag

If you’re using a memory tag then there actually is some limitation on the size. The entire tag configuration is stored as a JSON string that is limited to 268,435,455 bytes (0x0FFFFFFFF). A very large String value could push it over that limit.

I'd still limit it to, say, 64K.