The Institute clearly states that the article has to do 35 hours of training per week. As the institute puts it, the office for the Article should not start before 9 AM and not end after 7PM. And that the office should not start after 11 AM or end before 5 PM. The duration of 35 hours is exclusive of lunch period! The institute also provides that if for some reason the work period in a week reached 45 hours, then the Article has to be given compensatory leave.
Also, the trainee can claim set-off for each excess hours put in work. For example if the trainee has worked 40 hours in week A, then in some other week B he can work 30 hours and claim set off for the 5 hours that he/she worked excess in week A.