few as you can get away with using. this section should be mostly about saving time. have a look at the marking criteria, they're not looking for detailed answers.
My tutor said to do at least one technique + analysis of a quote for each mark for the 2-4 markers, I'd do some more though if you have time to be safe, but for the 6 markers honestly just write and analyse as much as you can in the time you have allocated becauseyou will probably be already writing till the very last minute in English exams