[Sangetsu]

You will not be able to even learn to memorize the writing of 2000 kanji in 100 days, let alone remember what they all mean. If you work hard, you might be able to fully memorize the 100 or so kanji (and their various meanings/correct kana spellings) on the JLPT4 test.

If you were smart, and worked hard at it, and lived in Japan (where you are exposed to the language full-time), you might be able to learn the 2000 kanji in 3 years.