How long does it take to unstake ANKR?

Could you please elaborate on the process and timeline for unstaking ANKR? Specifically, what are the steps involved, and how long does the entire process typically take? Are there any factors that might impact the duration, such as network congestion or specific timeframes for unstaking? Additionally, is there a fee associated with the unstaking process, and if so, how is it calculated? Understanding these details would greatly assist in making informed decisions regarding ANKR staking and unstaking.