Russia is fighting for bullshit reasons, so how heavy losses are they willing to accept as a people for basically nothing? At what point will it be enough?

Right now Russia is not forcing anybody in combat. They are mainly taking people dumb enough to volunteer and see them die. This will carry on for some time, but they are also starting to send foreigners to die. Also Russia is one of the most unequal countries in the world. So Putin spending a lot of money on soldiers and the worker shortages and increased war production mean plenty of well paying jobs for many Russians. Many Russians profit from the war. They can afford to buy cars, houses, dish washers, fridges and toilets, when they did not before.

So the Russian economy has to collapse and due to worker shortages, falling oil sales, higher import costs due to sanctions and a lot more it seems like it is starting to happen. However this will take time and that means thousands of deaths.