It's been interesting to see everyone's response. I'm glad to see so many people mentioned the difference between required time and desired time.
I spend 1-3 hours on my tank a day. Because I want to. I stare at it, feed it, sometimes talk to the inhabitants.

In reality, I only need to spend 5 minutes a day to feed and top off, and 20 minutes on a weekend to change water.

A big difference in the time you spend is the kind of tank you set up. If you have seahorses or non photosynthetic corals or something else that is considered difficult, you'll have much more time committed to it daily. But if you have a lightly stocked FOWLR or a mostly automated system it might take hardly any of your time.