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I was wondering if anyone could tell me the max length of the meta_value field for posts and user meta.

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Both usermeta.meta_value and postmeta.meta_value are stored as LONGTEXT. Here's how the MySQL docs describe the size of a LONGTEXT data type:

"A TEXT column with a maximum length of 4,294,967,295 or 4GB (232 – 1) characters. The effective maximum length is less if the value contains multi-byte characters. The effective maximum length of LONGTEXT columns also depends on the configured maximum packet size in the client/server protocol and available memory."

Source

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    It suffices to say that it would take a lot of text to max your limit. – Brian Fegter Feb 5 '12 at 6:10

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