Aside from feeding the fish, you shouldn't have to spend time on the tank every day. If you are, then there is something wrong.
I respectfully disagree...unless you do none of the following:
1. Checking the skimmer cup (cleaning if necessary)
2. Monitoring health of fish, corals and inverts
3. Scraping coralline off glass
4. Making sure powerheads are clean and working properly
5. Checking ro/di automatic fill reservoir
6. Wiping salt creep off bulbs
7. Cleaning out the sump of detritus buildup
8. Changing filter socks
9. Feeding the fish
10. Vacuuming the sand (unless BB)
11. Performing a water change
12. Cleaning the viewing panel(s) of film buildup
13. Going to the LFS to buy food/salt/etc. (this counts too)
14. Monitoring parameters as SPS and clams grow
15. Acclimating new arrivals to tank parameters/lighting (fish or corals)
16. Watching over a qt of either fish and/or corals
17. Making RO/DI water...replacing filters
18. Mixing saltwater
19. Trimming macro algae if you run a refugium
20. Refilling dosing pump containers or calibrating CO2 bubble rate
These are a few of my favorite things....
I'm confident that if many SPS keepers look at how much time they spend on any of the above examples, they'd be amazed at how much effort and time allocation is given to their tanks unknowingly. These forums are filled with people that had to break down beautiful tanks because of additional travel for work or other reasons that took them away from their tanks for more than a few days on a consistent basis. I know that even with a tank sitter I stress when I'm away for more than a day. If all we had to do was feed the fish and do a water change on the weekend then everyone would...and could do it. If it were truly that easy and simple we wouldn't need these forums to seek out advice. We could just all set up automatic feeders and call it a day. However, the fact remains that it takes a skilled hand, knowledge, and a determined soul to learn from mistakes, provide the proper care, intervene when necessary, and hope for success over the course of years, not months. The words simple and SPS are rarely heard in the same sentence for a number of the above reasons, requirements, dedication and nature of this type of coral.
Just MHO