Total test time is 205 minutes if taking the Writing/essay. Without the essay, the ACT is 155 minutes actual test time. Individual sections are always in the order of: English (45 mins.); Math (60 mins.); Reading (35 mins.); Science (35 mins.); and, optional Essay (30 mins.). Of course, there are short breaks in between sections.
Dissmissal time really depends on how soon they start. ACT says to plan on ~12:15 if not taking essay, or closer to 1:00 pm if taking essay.
Good luck to your D.