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-24hours limit.