Original sentence: They often take 4-5 years to compelete instead of 7-8 years to complete saperate degrees.They often take 4-5 years to complete instead of 7-8 years to complete saperate degrees
Edited sentence: They often take 4–5 years to compelete instead of 7–8 years to complete saperate degrees.They often take 4–5 years to complete instead of 7–8 years to complete saperate degrees