How long should I spend on the short questions and then how long on each long question? I'm doing higher level
You should spend around 35 minutes on each long question, and then around 20-40 minutes on short questions, depending on how much time you have. The questions you are good at will be shorter than the others, so that'll give you more time on the others.
30 for each except you can give yourself 35 for orthographic if you choose it