flexible staking does not have an end date for storing coins and the investor can stop participating in the validation process at will. As a rule, interest begins to accrue within 24 hours after the funds are deposited, and rewards are paid every 30 days. It should be noted that interest will be accrued until the user withdraws the coins: https://cryptorobotics.co/staking-what-is-it-and-how-does-it-work/