I have a technical question that's too long to fit the title(more in the body)

Full question: If Riot would completely shut down league to do a full maintenance, how long would it take for them to fix all the games bugs and performance issues?

I'm sorry if this isn't the proper place to ask. Feel free to remove it, and redirect me to a more proper board or something.

I just remember that i heard somewhere, that most of the games bugs couldn't be fixed, because the game is running constantly