The daily timing for a class 11th science student with PCMB (Physics, Chemistry, mathematics, biology) subjects generally depends on the school or educational board (CBSE, ICSE, State Board) , but  a typical school day ranges between 6-7 hrs. In total, students usually attend 6-8 periods per day, covering core subjects along with English, PE, and other optional subjects.

Since PCMB includes both Biology and Mathematics, the student has to attend extra science classes compared to PCM or PCB. Some schools adjust the timetable to include double periods for lab sessions (especially for chemistry, and biology) , usually once or twice a week.

In coaching integrated schools or private institutions (like Allen, Aakash, FIITJEE, etc.) , classes may run in two shifts such as morning shift and evening coaching. It is best to check directly with the school for the exact timing, as it may vary across institutions and states.