I don't think looking at that would help you too much. keeping a reef tank is like keeping a car, everyone's driving a different make and the maintainance can vary depends on what you have and how you run it. I spend 10-15 hours a week among my fish tanks and my philosophy for maintainance is just do what you see needs to be done. If you see the filter is clugging up, change it even if it's not over a month, if you see the skimmer cup filling up empty it even if you just did it two days ago. If you feel your water flow is not as strong as three month ago then take your pump or power head apart and clean them even if the instruction says half a year. Most of my maintainance schedule really came down to how well I know my tank and my experiences. In time it will become a 2nd nature to you.