A common approximation is that 1 semester credit equates to 15 hours of work (including class time, homework, studying, etc.). Using this estimate, 32 semester credits would be approximately 32 credits * 15 hours/credit = 480 hours.
However, this is just a rough guideline. Some programs may be more intensive, requiring significantly more than 15 hours per credit, while others might require fewer. To get a truly accurate estimate, you'd need to consult the specific institution's credit hour policy.