My opponent was playing slowly (but within time) for the whole game. Then, when we were a couple turns from finishing, they stopped playing. With around 10 seconds left, they proposed changing to turn-based. I had no intention of doing this. The game was almost over and there were no interesting decisions left to make. I expressed as much in the chat, suggesting that if they couldn't play they could just concede. They did not respond or play their next turn for several minutes. Then I opted to just kick them from the game for being over time. The system did its usual (idiotic) thing of counting down from 20 before booting them. At around 10 seconds, they took their turn. This cycle of minutes of inactivity punctuated by taking their turn just as they were about to be kicked occurred thrice before they conceded. Does the opponent know when that countdown starts, or was it just coincidence?
in case it matters, this was the table https://boardgamearena.com/table?table=945968952
in case it matters, this was the table https://boardgamearena.com/table?table=945968952