The timing depends on each department. Each department usually has different shifts.

Most of the days the classes start from 9:00 AM or 9:45 AM and go on till 3:30 PM to 4:15 PM. 

Some classes can also start from 8:15 AM but this goes for the final year students only.

A BA or B.Sc. students have class timings from 10 AM to 4 PM. B.Com students have both morning and evening classes. BBA only has morning shifts.