To make heatless curls last, it's important to follow a few key steps:

1. Start with clean, dry hair: Ensure that your hair is clean and dry before attempting to create heatless curls. This will help the curls hold better and last longer.

2. Use the right products: Apply a lightweight styling product, such as a mousse or curl-enhancing cream, to your hair before styling. This will help to add hold and definition to your curls.

3. Choose the right technique: There are several heatless curling techniques you can try, such as braiding, twisting, or using foam or fabric rollers. Experiment with different techniques to find the one that works best for your hair type and desired curl pattern.

4. Allow enough time for the curls to set: Once you've styled your hair, give it enough time to set. This can vary depending on the technique and your hair type, but it's generally recommended to leave the curls in place for at least a few hours or overnight.

5. Secure the curls: To help the curls last longer, consider using bobby pins or hair clips to secure them in place while they set. This will help to prevent them from unraveling or losing their shape.

6. Use a hairspray or setting spray: Once you've removed the curlers or released the braids, lightly mist your hair with a hairspray or setting spray to help lock in the curls and provide extra hold.

7. Avoid touching your hair too much: Throughout the day, try to avoid touching your hair too much, as this can cause the curls to loosen or frizz. If necessary, use a wide-toothed comb or your fingers to gently separate and define the curls.

8. Protect your curls while sleeping: To help your heatless curls last overnight, consider sleeping on a silk or satin pillowcase or using a silk or satin hair wrap. These materials create less friction than cotton, which can help to prevent frizz and preserve the curls.

By following these steps, you can enhance the longevity of your heatless curls and enjoy beautiful, bouncy hair without the need for heat styling tools.