"You will have until December 31, 2024 to decide how you would like your Rollover MQMs converted. You can choose to convert them to MQDs, miles or a combination of both. Members with MQM Rollover balances over 100,000 can also choose to extend their 2024 Medallion Status for 1 year per every 100,000 Rollover MQMs."
From the Delta site.