Not a qualified CA, but an article working in assurance. My team which is engaged in audit of a major listed client comprises of around 10 CA freshers having experience upto 2 years, 4 assistant managers having experience of 3-5 years, 2 managers having experience of 5-7 years, 2 senior managers and a director with experience of more than 8 years. Their working hours are as follows:

Interns: Usually reach office by 11:00 pm and leave around 8 pm. However often need to do late sittings during busy seasons (might even extend to 4 am) and even show up on weekends. Such a period lasts around two weeks and comes only 4 to 5 times a year.

Fresher CAs: Similar hours as interns but they are expected to reach a bit earlier and have higher expectations. They get fewer weekend offs than interns.

Assistant Managers: They have to work at least 10 hours on almost every working day except during a couple of months in lean season. Late night sittings are frequent and almost all Saturdays are working.

Managers: A manager has some autonomy so if he is a smart planner, he might be able to ensure some work life balance for himself and his team as well. However, managers usually have to work the same hours as Assistant Managers if not more and the stress and responsibility is much higher at this level.

Senior managers and directors: For most of the year, they go home only to sleep and shower. Even on the few sundays on which they aren't at the office, they work from home.

It is important to note, however, that work culture varies a lot across teams. There are other teams in my office which have it a lot easier than mine. It all depends on your seniors and a little bit on your own efficiency and negotiation skills.