For VALOR:
You can either choose 6 months or 12 months of staking. Currently SMART VALOR does not offer any other option.
For DASH:
There is a minimum staking period of 1 day.
For Kyber:
The minimum staking period is 1 day. Users of SMART VALOR can unstake anytime they want. However, to receive the staking rewards a user has to stake its KNC tokens during a whole Epoch.