The Aquarium Project - Time & Effort

A 10-20g tank, once it is set up, expect to spend about 30 minutes every other week doing partial water changes, cleaning the tank, etc. You will also spend a few minutes once or twice a day feeding your fish, turning the lights on and off, etc.
Be prepared to spend several hours researching the hobby before you make your first purchase. The more time you spend BEFORE you actually get the tank, the smoother things will go. Visiting fish-tips.com will help you along the way. You might also want to get some beginner books.

Most people who get frustrated with fish tanks made mistakes that could have been easily avoided. The way to avoid mistakes is to learn the basics, before you put fish in your tank. Remember: most aquarium problems are easy to prevent, but hard to deal with after the fact.