How many meters can a 250w transformer go, led strip?

This depends on the product specifications, and cannot be generalized. Generally speaking, the longest connection distance of 3528 series LED light bars is 20m, and that of 5050 series LED light bars is 15m. If this connection distance is exceeded, LED strip will easily get hot, which will affect the service life of LED strip. Therefore, the installation must be carried out according to the requirements of the manufacturer, and the LED lights should not be overloaded.