Validators can choose to validate for 3 months, 6 months, or 12 months (the minimum lock-up period is 3months). Validators can choose to self-delegate (i.e. put up the entire staking amount themselves) or elect to accept any delegation and have the option to provide a commission rate to the delegators. Staking for the longer durations will have a slight multiplier applied to the monthly payouts from the bounty pool.