How many times can Barcelona Real Madrid meet in a season?

In theory, you can touch it up to six times a season. There are two leagues (this is fixed), two King's Cups (home and away games, but not necessarily) and two Champions Cups (domestic teams can't meet each other, so at most there are two rounds of home and away games, but not necessarily, if it is a final, there is only one), so there are six games at most and only two at least.