Stock duration is like how long you can play with your toy before you have to give it to someone else or put it away.
When you buy a stock, it means you are buying a tiny part of a big company, like owning a little piece of a big toy store. The company can do well and make a lot of money, or it can do badly and not make as much money.
The duration of a stock is how much time you want to keep that little piece of the company before you sell it. It's like how long you want to play with your toy before giving it away.
If you want to keep your stock for a long time, maybe because you believe the company will do well and make more money in the future, you have a long duration. But if you want to sell your stock quickly because you think the price will go down, or you need money for something else, you have a short duration.
The length of time you hold onto your stock, or the duration, can affect how much money you make or lose. Just like how different toys have different durations of playtime, stocks can have short or long durations that can impact your investment.