The length of time that you can keep your winning lottery ticket will depend on the specific rules and regulations of the lottery, as well as any applicable laws in your jurisdiction.
In general, it is a good idea to keep your winning ticket in a safe and secure location, such as a safe deposit box or a secure location in your home, until you are ready to claim your prize. It is also a good idea to make copies of the ticket or to take pictures of it to protect against loss or damage.
In many cases, lottery winners will have a certain amount of time to claim their prize, known as the "claim period." The claim period may vary depending on the specific lottery and the type of prize being offered. For example, some lotteries may have a claim period of a few weeks or months, while others may have a claim period of several years.