Is there a limit to the number of values a List tag can contain?

No, there is no explicit limit on the number of values that can be stored within a List tag — a List tag can hold practically as many values as your use case requires.

A few practical notes:

Keep single API requests small. Do not push very large batches at once; as a rule of thumb, avoid setting more than ~50 tag values in one /setTags or /setEmailTags request, and split larger updates into several calls.
Update incrementally. Use the append and remove operations of /setTags to add or delete individual values instead of re-sending the entire list.
Mind CSV formatting on import. When importing List tag values from a file, the values must be formatted as a quoted JSON-style array (for example "[""news"", ""sports""]"), otherwise the whole list is imported as a single string value.

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