Odaily News According to the official announcement, in order to optimize the Upbit NFT service, the official will conduct a database inspection. The maintenance time is 05:30-07:30 on May 29th, Korean time (estimated to be about 2 hours). During this period, the Upbit NFT service is unavailable, and NFT recharges and withdrawals based on Ethereum and Polygon chains cannot be performed in the Upbit NFT service.