Each grant lasts 30 days. It is not billed. The same email and IP keep one open grant. After 30 days the grant expires and nothing is charged. A new grant can be issued, and that grant is not billed either.

This server copies the ledger every 15 minutes and keeps a second copy. Download a copy and store it away from this server. If this server stops, install NCpanel on the replacement and restore that file. Open grants continue from the copy.