How can I withdraw my cryptocurrency to my bank account?

Hello there, could you assist me with something? I've been investing in cryptocurrency for a while now and I'm wondering how I can withdraw my holdings to my bank account. Is there a specific process I need to follow? Are there any fees involved in this process? And how long does it typically take for the funds to reach my bank account? I'd really appreciate it if you could provide me with a step-by-step guide on how to accomplish this. Thank you in advance for your help!