When will I be able to read novels and manga and stuff in Japanese without a dictionary?
That’s a function of how much work you do. The more you do per day (the more sentences you learn), the sooner you’ll be able to read all kinds of cool stuff without a dictionary. Keep in mind that Japanese is a living language and new words, trends and slang do get created from time to time, just as in English. But, yes, you can and will become free of dependence on your dictionary one day in the not-too-distant future, given concerted effort.
