You can also change the time using the xset s [value] command, where [value] is the time in seconds. The default value is 600 ...
Wait, there are already so many drivers for WS2811/WS2812 on crates.io? At the beginning I was not aware of that WS2811, WS2812, WS2812B, ..., WS2818 are basically the same. I just did not notice it.