How long does it take to unstake?

Could you please explain the process of unstaking and approximately how long it typically takes to complete? I'm interested in understanding the timeline involved, as it seems to be an important aspect of managing my crypto assets. Is the duration dependent on specific factors like network congestion or the type of staking mechanism used? Additionally, are there any potential delays or pitfalls that I should be aware of? I'd appreciate a detailed answer that covers all these aspects.