Docs: https://docs.google.com/document/d/1EaaVyJWSr4MWFyCREwVIuc8aE8hOEbCnQ5B31P5tQU0

After each successful swap, wait 24 hours before using it again to avoid verification and keep the bonus rate.

The first completed transaction has consistently gone through, and there appears to be no maximum amount—only the one-use-per-24-hours limit.