Certainly! You can let paint thinner disappear by letting it turn into air, but it's important to be careful.  When paint thinner evaporates, its liquid part changes into the air. It's a slow process, so give it time. You should keep in mind that the bad air from paint thinner can be harmful to breathe, so only do this in places where it won't reach people or pets. Remember also that paint thinner can catch fire, so avoid flames or heat sources.  If you're unsure, it's better to ask experts or use the proper places to get rid of it safely. Always think about the environment and follow local rules.