How long does ETH take to unstake?

Could you please clarify the process of unstaking ETH for me? I'm curious to know approximately how long it takes for the unstaking procedure to be completed. Is there a specific time frame involved, or does it depend on various factors? Could you also explain what happens during the unstaking period and whether there are any associated risks or costs that I should be aware of? Thank you for your assistance in clarifying this matter.