I know neural networks

• Forward prop
• Back prop
  I’ve done CNN image classification and know how it works.I mean how the pooling convolution padding works.
  Then I know python very well.
  I just learnt the theory of rnn and lstm but didn’t implement them for nlp
  Now I need to learn transformers , and build a maybe llm, chatbot I need to be at a good level to apply for maybe a NLP internship
  What and how long will it take me to do this
  What else will I need to know, how long may it take.
  When can I know that I’ve completed learning full NLP ?

Can anyone provide the answers.