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I would imagine the limit would be determined by your data source, rather than Tableau. While not specifically regarding parameters, the following workaround by Marc Fernandes might help you if you run in to trouble:
Thank you @vincent baumel
There isn't a limit on string parameters. As Vincent said, some databases have limits on the lengths of their queries or on their string fields.
there seems be be a limit.
I am connecting to SQL server store proc that has a parameter.
It is only taking like about 34000 characters.
Is there any configurations that I can change?
There's no limit on Tableau's side. Far more likely SQL Server is rejecting something that long. Without seeing the actual error message, it's hard to say for sure.