As per the JEE Main 2018 exam pattern, the exam duration of both the papers is the same - 3 hours each. Paper I comprises of questions in the subjects of Physics, Chemistry, and Mathematics, each of equal weightage. Paper I carries a total of 360 marks; there are a total of 90 questions each carrying 4 marks. Paper 2 of JEE Main also has three subjects, but the subjects are Mathematics, Aptitude Test, and Drawing Test. The total marks of Paper 2 are 390.

You can check the complete details from the given below link

JEE Main 2018 Paper Pattern

Good luck!!