As of Friday, December 09, 2022, it would take 0.000 days to mine 1 Ethereum at the current Ethereum difficulty level along with the mining hashrate and block reward; a Ethereum mining hashrate of 6,000.00 MH/s consuming 4,500.00 watts of power at $0.10 per kWh, and a block reward of 2 ETH.
One Ethereum - or 1 ETH - does not, theoretically, take long to mine. Ethereum has a block time of around 13 to 15 seconds, with each block rewarding 2 ETH. However, this does not mean you will be able to earn 1 (or 2) ETH after 15 seconds of mining.