The minimum duration of staking assets in the Venga app will vary depending on the actual staking product. There could be multiple “products” of the same asset with different lockup periods and different RPY (Rewards per Year).
Be sure to check the detailed page of each asset that you want to stake and review all the information listed.
In the example below you can see in this case that ETH has a fixed lockup period of 30 days, an RPY of 2%, and a processing time of 8 days, which is the amount of time it will take for your funds to be available after unstaking.