I have noticed after setting up my Minecraft server day cycle is only 10 minutes when it’s usually 20 i have been looking all over the amp panel and the and idk why i cant use the gamerule /gamerule DayCycleLength to put it back to 1 to set it back to 20 minutes
There isn’t a built-in way to do this sort of thing, you’d need to find a mod/plugin that adds the feature, but I have heard that the changes to day lengths can mess with other things in-game.
The gamerule you’re trying to use there is from a Mojang community suggestions board and isn’t an actual feature in-game.