How many seconds of a classical music recording can you use before copyright infringement?

The length of time you can use from a classical music recording before copyright infringement depends on the copyright laws in your country. There are different interpretations around the world, but generally, you may use up to 30 seconds without permission from the copyright holder. However, it is important to note that even short clips can be subject to copyright protection, and it's always best to seek permission if you plan to use any copyrighted material in your project.