Time of disconnection enough to forfeit

I play very long games on Lichess. And from time to time my connection drops. Which, in theory, should not be a problem in 20+10 or higher time controls. But from time to time my opponents run to claim a victory in totally lost positions when I am disconnected, like it hapenned in this game: lichess.org/TR6CWMs3/white
I had 6 minutes left vs 25 seconds on my opponent, I had +9 advantage with no counter-chances for my opp at that moment, then I suddenly lost connection for a short time, and my opponent claimed victory ASAP - in 1 minute.
What I want to say is this time treshold is maybe ok for Blitz and Bullet to prevent people to rage-quit the games in lost positions, but it is ridiculously low for Classical, especially for the games >20 minutes per side. If the one agrees to play such a game he should have patiency to wait for disconnected opponent for a few minutes. I do not leave the games intentionally! Especially I have no motivation to do it in totally won positions. And "claim the victory" option in such situations is absolutely weird and very annoying.

I agree, for slower games the disconnection window should be longer.

3-5 minutes, I would say... At least. IMO.

Yes, I also agree with @Alex_slow . It also happened to me many times. My connection is lost in a classical game and my opponent claims victory after only one minute. I think the opponent should have the option to claim victory after 5 minutes at least in long timed games

Why not adding the following condition:
The one who claims the victory should have more time on the clock then the disconnected one.

Agree with #1.

I agree. I play Classical games.

We need time to RESET COMPUTER, RESET INTERNET MODEM AND ROUTER, then come back to lichess.

Short time disconnectios happen very often in most of the world

There should be no disconnect timeout.

If there is time on your clock you should never lose on time regardless of whether you have disconnected or not.

If you want a 3rd time control, a maximum time per move, then add it to the server and allow it to be used for games.

Stop being like chess.com. What's the point of having 2 chess playing sites if you're both exactly the same.

I'm starting on coding an improvement in http://github.com/ornicar/lila/blob/master/modules/round/src/main/Env.scala#L99 , but that needs visibility to the game time control...