How can I edit tickets number in Portal builder?

Yes you can. I set mine at 150. Still has the 15 minute max time though.

It is in Rules, Gameplay, Set Game Mode Target Score

under core go to game mode details, then reinforcement multiplier , i set mine to 1.5 gives around 1200 tickets. Hope that helps.

Apparently that does not work for custom game modes like custom conquest. There is no such setting

In TDM, you can set tickets to whatever you want.

I have 1000 in one of my servers.

just set the ticket amount using the target score block.

you can adjust the amount of reinforcements in conquest and rush.

but in custom conquest, they removed the ability to adjust reinforcements.

god knows why.

so stupid.

You can adjust the game time but not the reinforcements in custom conquest.

so stupid that dice did this.

there is also less maps available in custom conquest.

You can mess with the rules editor but because you can’t have a choice of many maps or adjust the reinforcements, it makes it pointless to play 

Just so you know, you can also set the game time in TDM games.

just use the set game time limit block