ACT stands for American College Testing. It is recognized nationally as a college entrance examination. High school students take the ACT as part of their college application process. Four subject areas are covered by this exam: English, Mathematics, Reading, and Science. Another aspect of the ACT is the ACT Writing Plus exam, which includes a Writing section. Some colleges require the Writing section for admission. The time duration of the ACT test is 3 hours and 30 minutes (without the Writing section), and 4 hours if the optional Writing test is included.

https://www.testpreptoolkit.com/act/12-act-test-frequently-asked-questions/