Holding st-yCRV for a certain number of days to start seeing a profit depends on a variety of factors, including the market conditions, the amount of st-yCRV you have, and your investment strategy. Generally speaking, the more st-yCRV you hold, the more potential for profit. It's also important to keep an eye on the market conditions, as these can affect the value of st-yCRV. Additionally, it's important to consider your investment strategy when deciding how long to hold st-yCRV. If you are looking for short-term profits, you may want to consider trading st-yCRV more frequently, while if you are looking for long-term gains, you may want to hold your st-yCRV for a longer period of time. Ultimately, the best way to determine how long to hold st-yCRV is to research the market conditions and your investment strategy and make an informed decision. Additionally, you can check out Yearn Finance for more information about st-yCRV and its potential for profit.