The suicide of a woman who worked excessive hours at Japan's biggest advertising agency has prompted the company to lower the amount of overtime employees can book.

From November, workers at Dentsu Inc. won't be able to log more than 65 hours of overtime a month — down from the current limit of 70, company spokesman Shusaku Kannan said Tuesday.

Tokyo's Labor Standard Inspection Office determined that overwork pushed 24-year-old Matsuri Takahashi to take her own life after she suffered a mental breakdown, local media said. Takahashi reportedly worked more than 105 extra hours in a single month.