Yeah, the basic pattern at 50 was 1 trial required per patch(not counting ifrit titan and garuda hard - those were extras that you needed to catch up on), and a required dungeon every 2nd or 3rd patch. Once you get to the expansions its a dungeon every odd level(1 optional per expansion), one trial early in the cycle and one late until you reach the cap. Each cap level starts with a dungeon and trial, then its similar to 50 with each patch having a dungeon a trial or both(HW and SB have been tilted a little more toward required dungeons then required trials compared to ARR). There are also a ton of extra optional dungeons trials and raids at all 3 cap levels.