Staring us right in the face!
Whenever Q says "10 days.", it means that whomever they are going after have 10 days to make a deal/comply. Once that is up, they forfeit their one and only chance to save themselves.
"10 days." doesn't mean we will see ANYTHING happen on our end. It is a message for THEM!
"Darkness." means it was their last chance, collectively. We are truly in the end game. Sides have been drawn and we are seeing it all play out now. We're just going through the motions.
There's articles saying it's something in esperanto, from "sori", to soar. Which might also tie into the owl thing, maybe.