Answer: except no 4 justice hear oral argument for 50weeks but only on Mondays.
Explanation: it is only on the month of May to June that the court meet on Mondays at 10am but as the month progresses(mainly the last week's) additional days are added to it usually called opinion days.
Oral argument in the supreme Court are held on Mondays, Tuesday and Wednesday alone unless the court deem it fit to add an additional day or days to it. Oral argument are open to public view with a specific time attached to it.