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It's hard to say... At the tournament in Yekaterinburg, there were several games on the 6LM10A map, and almost all of them lasted for 10+ hours. So, closer to the final stages, people stopped playing on 6LM.
In Yekaterinburg, players would switch to LM when someone felt they had an advantage in the late game. There were games like:
Napalma vs. Clone, where Clone played much better in the late game but had a poor start, leading to an early encounter and a long game;
Goose vs. Misha, where Misha killed the main hero, which prolonged the game;
my game with Alone, where I had a good start and finished the game in the early third week after 5-6 hours of play.
I think LM games in Yekaterinburg are not a good indicator of anything.