I / look for / advanced course / perhaps / three / four hours / day.
A.I will look for an advanced course which perhaps lasts for three or four hours a day.
B.I will look for an advanced course, that perhaps lasts for three or four hours a day.
C.I am looking for an advanced course which perhaps lasts for three or four hours a day.
D.I will look for an advanced course which perhaps is lasting for three or four hours a day.