I'd say write at least one essay everyday. You won't need to write much. I'd say, write 4 timed LAs, write 3 timed contexts, and 3 timed text responses. That should be enough. The rest of the time can be devoted to perfecting your essays after your teacher critiques them and compiling notes on themed paragraphs (IMPORTANT FOR TEXT RESPONSE).
For text response in particular, make you're you've written several untimed essays which cover a BROAD range of topics. Make the paragraphs as perfect as possible...and then you will see that several points can link in with other prompts. That's why themed paragraphs are important, you can tweak them into your essay.
Memorising essays will help you write quicker as you won't have to worry about expression, but there's a big risk because you may not necessarily link in with the prompt enough. So be very mindful of that. Memorising ideas and main points for each "themed" paragraph will be a better way to go about writing things, it'll give you much more flexibility in adapting points to a new topic.