In order to succeed in the course, first, you must attend the weekly shiur and review what is taught. If possible, it would be helpful if you also prepared before a shiur. It's hard to say how much time to put in, in addition to attending shiurim because every student's abilities are different as well as the level of knowledge each one aspires to. In any case, take into account the actual shiurim and the learning you do on your own.