Although the question is pretty clear on the tittle I'll explain it a bit more.
I'm pretty tired of people asking me to duo every time I open the game maybe because I'm on a winning streak or quickly climbing divisions lately and having to tell them next time, or that I'm taking a break to not completely turn them down. I'd like to delete pretty much everyone except 2-3 people.
Now, as we all know the deleting process takes a while in League so I've been wondering if anyone knows a faster way, like accessing the game files or pretty much deleting many people at once so that it won't take me an hour to delete 200+ friends.