How long do you have to live in Dubai to not pay tax?

You will also have to make sure that you actually reside in your declared country of residence for more than 183 Days per year. Be aware that this 183-Day-Rule also applies to individuals with the Non Dom status – regardless of the country where they have the Non Dom status.

https://www.tax-residence.com/uae-183-day-rule/#:~:text=You%20will%20also%20have%20to,have%20the%20Non%20Dom%20status.