Roughly how much time do you think needs to be spent on revision for the ACT if you are targeting a score of 33-36? I have done the SAT before and therefore have a basic grasp of most concepts involved in the ACT.
Honestly, however much time you need. Some people can obtain those scores without studying. Others will need a very long time. Take a practice test and then use that score to determine how long you need to spend studying.