Im running some local tournaments in Poland and i have some questions about that to do in certain situations:

1. We have 120 minutes per game, but what to do when one guy is taking most of that time (like thinking 30-40 minutes about a single move) anbd in result he and his opponent cannot finish a full 6th game round and because of that he gets more favorable score cause his opponent didnt have time to play.

2. One player keeps abusing certain rules (like premeasuring with movement templates even tho its forbidden and he was notified about that fact and didnt do anything to play correctly)

What would you do in theese scenarions if you were the judge?

These situations are tough, because you don't want anyone to have a bad day. I always start tournaments stating players need to play at a reasonable pace, and if an opponent is taking longer than normal, to call a judge, and to not feel bad to do so. Tell players to remind each other to play at a reasonable pace so they can finish the game. If a player is still taking this long, issue them a warning. If they continue, issue them a game loss.

For the second scenario, if you've mentioned the rules about premeasuring to them before, give them a warning, then a game loss.

Inform players about these rules BEFORE the tournament so people are aware. Tournaments with relaxed rules are still tournaments, and players need to hold themselves accountable to those standards. If they cannot, do not feel bad for reprimanding them.