Bonus in big 4 is usually a joke. There is no AWS like what the ex-KPMG director said. Average number is 2-3 months, with most getting towards the lower end of that range. If you "deduct" the 13th month bonus that most other companies pay, you're only getting about 1+ month bonus.

Working hours in big 4 is well known, leave it up to you to count if it's worth it financially. Big 4 is often used by people as a stepping stone and not an end point.