Looks like you can count one game for TGP per game that counts. So if you’re doing best game on two different games then TGP of two (8% I think).
Plus 1% per hour of unlimited qualifying. TGP Guide
Best Game Style Qualifying (Herb)
1 game added to TGP per game counted towards your qualifying points earned
If 9 games are available but only 5 games are counted towards your qualifying standing, only 5 games will be added to the TGP
If unlimited qualifying attempts are available, the number of hours of open qualifying will increase TGP by 1% per hour up to 20% for open qualifying of 20+ hours
Please note this format is not IFPA endorsed unless there is a finals component that involves DIRECT play, made up of at least 10% of the participants
Please note the qualifying portion of the tournament can be added to the TGP calculation only if that qualifying portion reduces the field of participants by 50% or more
So if you did three hours of qualifying (+3%) on two games (+8%) with a two game finals ladder using four player groups (+2 TGP, 2x multiplier for four player groups=+4 or 16%) I think you would grade out to 27% TGP.
But you have to reduce the field by 50% or more to count the qualifying portion. So if you’re taking eight players to finals you have to have sixteen or more participants. Otherwise you just count the finals portion for TGP.