A contact hour is 50 to 60 minutes of engagement in the learning activity, depending on the organization approving the activity for credit. The total minutes of educational activity is divided by 50 or 60 to determine the number of contact hours.
One CEU equals 10 hours of engagement. The CEU was developed in 1970 by the International Association for Continuing Education and Training (IACET) . However, the term is not protected, so anyone can use the term regardless of whether an activity meets these requirements. Look for a statement that the activity has been approved by an independent organization; then, you’ll know the CEU is used appropriately.