对你的问题的回答， 我觉得要看你的目标是什么。 你是只要可以平常对话还是为了专修写作？
这个问题我在研究中。 我看多最经常回答是 2000-3000。 我刚刚在个网站上做了个测试， 那个测试估计我知道 3450 个汉子。 可是我个人觉得我根本没有知道那么多的字。 我还在列出我所知道的单词， 所以过几天应该会有个答案的。
这个要看你会付出多少。 我在 YouTube 上面看到一个香港人在 3 个月里面达到可以和德国人交流的等级。
看你在问这个问题， 我不是很确定你看的懂这些回复吗？ 你的母语写的是英文， 所以我在下面做个英文的回复。
To answer your questions, it really depends on your goals. Are you aiming for a conversational level or a more professional writing?
I am researching this question myself. The most frequent answer that I have found is 2000-3000 (also known as the "most frequently or commonly used Chinese characters"). I did a small test on a website that is supposed to estimate how many Chinese characters you know. My result was 3450 Chinese characters. However, I feel like I don't really know that many words. I am still working on listing out all the Chinese characters that I know, so hopefully I will have a rough estimate in a few days.
It depends on how much effort you are willing to put into. I saw someone on YouTube who manages to do a 20 minute conversation in German after learning it for 3 months. He is from Hong Kong I believe. He has a diary of the 90 day challenge where he records his progress every day (I think, I have to double check that since I haven't watched all the videos yet).
Because of the questions that you asked, I am not sure if you understand my Chinese reply. Since you have English as your native language, I decided to write a reply in English as well just in case you have any trouble understanding the Chinese reply :)
I hope this helps. Good luck!