A minimum can be constituted-of-or-filled-with some credits.
A minimum can be constituted-of-or-filled-with some (credit hours).
A minimum can be constituted-of-or-filled-with some (semester hours).
A minimum can be constituted-of-or-filled-with some courses.
A minimum can be constituted-of-or-filled-with some minutes.
A minimum can be constituted-of-or-filled-with some percent.