It will drag for long for sure but it always depend how the conflict evolve. Escalation to nuclear weapons is a no-go for Russia but NATO are poking wildely. Russia’s economy is surviving but on a tight rope, the sky is not out of clouds..Speaking of ending conflict, personally, I think that now it is the Russian side that may be less willing to promote peace talks: Russia’s domestic economy and finance are basically stable, the people have been mobilized, domestic affairs are basically controllable, and the vast majority of third world countries are basically neutral. This year, Russia’s economy may even grow positively, while Western Europe’s politics and economy are generally not good, not to mention the United States. If the war continues until next year, then Biden might as well withdraw from the election. If I were Putin, I would definitely try to drag the war into next year.
Do they want the situation to escalade to that point ? Where and when they will stop ?
Ukraine ''leadership'' don't care at all and if they got anything to escalade the situation they will use it for sure. Clearly, Russia leadership would not want escalation to a state of a NATO direct conflict (beside zealot Medvedev). Right now any nuclear reactors in posession of Ukraine is a ticking bomb for Russian advance.