Same here, sometimes twice a day, sometimes I skip a day.
As stated it can depend a lot on the fish, but it can also depend on the setup. Many fish in the right tank can find a lot of natural food to feed on. Feeding them too much can minimize their benefit to the system (and unnecessarily introduce more nutrients, promoting algae). The most important thing is that they eat well. Second is that they eat the right food. Although variety is a great way to achieve this, IME it is not the only way. The right food can provide all of the nutrients needed in every bite, resulting in even healthier fish.