Either, most leagues if they have indirect league play on regular league nights will add a finals to meet the match play component. If they have regular match play they generally just submit the final standings.
If they run a final that runs into your other question
It's exactly the same as a tournament. I've had to deny leagues their entire year of play because they took more than 50% of their players into a final. If they want to run a final that determines the final positions of their players it can't have more than 50% of the players participating in the final otherwise the "season" is deemed as not meaningful and excluded from the TGP calculation.
Calculated normally. If a league players for 4 weeks, groups of 4, 4 games a night, that is 32 TGP right there.
If a league plays indirect qualification, 1 game a night for 4 weeks, that is 4 TGP. If that same league then plays a 3x final with less than 50% and more than 10% the TGP for that final is added onto the 4TGP they got from the season
It's games, just like unlimited qualifying.
If you have a league that plays 10 games of indirect qualifying a night, for 2 weeks, in order to be able to include a player in the final rankings, that player would have had to play 10 games in the league over the 2 weeks.
Match play is a bit easier since it's less likely a player is going to leave in the middle of a match but does happen, but the same rule applies. If you are playing groups of 4, 4 games a night for 4 weeks, the player has to have played in 8 games (or 2 full matches) in order to be included.
We trust that our Tournament Director's are aware of our requirements and are submitting accurate data. We police and verify when we can but obviously with the number of submissions it is impossible to vet every single result submission. So we also rely on our player base to police the community as a whole and we investigate anything brought to our attention via a player.
So far that has been working just fine.