Yikes, I think Poilievre may be overplaying his hand here.
His threat is an idle one:$1:
The problem is that, despite the threats that Conservatives like Melissa Lantsman are making, is that they can’t actually force the House to sit past December 15th. MPs long ago put the fixed calendar into the Standing Orders, and it would take a unanimous consent motion to change that date, which they’re not going to get. And if they think they’re going to exploit the loophole of keep voting going for days on end (which would technically be one sitting day that lasts beyond twenty-four hours), well, Poilievre is going to find his own MPs are going to start getting pretty upset with him because they have families, and constituency business to attend to, and this kind of thing gets pretty tiresome really quickly.
This might look good to average Canadians who don't know about the Standing Orders, but it's going to make Poilievre look stupid when the House automatically shuts down next week anyway. And as Dale Smith notes, Poilievre's caucus are people too, and they have families and constituency work they have to look after. He also risks pushing the NDP, Greens and Bloc to back the Liberals anyway just to shut him up if he keeps making all these motions and amendments.
Maybe Poilievre is using this to make the case for his getting a majority government, but it also seems like he's playing a big game of political chicken. And the thing about games of chicken is that if one player doesn't eventually blink, they both get plowed under.