Often, avoid exceeding the suggested strip light's length, because the LED strip’s voltage will have fallen and thereby leads to less brightness of lights. Next, it can result in inconsistent lighting through the strip. Here is the highest length of LED strip light as per their voltage rating such as
For 12V DC strips, the highest length can be 5 meters. For 24V DC LEDs, the maximum length could be 10 meters. For 57CC LEDs, you might run up to 20 meters.