The time it will take to pay off the loan for an average student depends on the kind of job you have landed and your personal expenditures and commitments. The other factors that might affect are your lifestyle, dependencies, loan amount, cost of living in your city, etc.
For a high-paying job, (around 20+ LPA), it will take 2 years maximum if you have no commitments, while 3-4 years if you are supporting your family.
For a less-paying job, it will take 3-5 years if you don’t have any commitments, while 5-7 years if you are supporting your family.
So the maximum time taken to pay off the loan is 7 years. Also, there are many EMI calculators available online. You can use them to calculate the exact figures.