Welcome to the hobby and the site!
I'm not sure about the instructions on your particular kit, but many kit beers say to add corn sugar (or table sugar) to the wort to boost the alcohol content. This definitely does accomplish that, but results in watery beer.
Tell us more about the kit itself -- what style, what kind of ingredients were in it and whether you had to add anything (besides water) to it.
Without knowing more about the kit, it's hard to tell you when to expect the beer to be finished. Stronger beers in general take longer than lighter (alcohol level -- not color) beers.
Sorry I can't be of more help, but with more specifics, we can figure this out.