How long does it take to withdraw Ethereum?

Good afternoon, I am quite new to the world of cryptocurrencies and am currently exploring Ethereum. I understand that it is a popular platform for various financial transactions, but I am still somewhat unclear about the withdrawal process. Could you please enlighten me on the average duration it takes to withdraw Ethereum from a crypto exchange or wallet? I assume it involves multiple steps and verification procedures, but I would appreciate a detailed breakdown. Additionally, are there any fees associated with Ethereum withdrawals, and if so, how are they calculated? Thank you for your time and assistance.