Organised by four anonymous creators who described themselves as recent graduates, the “Worker Lives Matter” campaign calls on employees at tech firms to enter their company name, position, and working hours in a spreadsheet posted on GitHub.

As of this morning, more than 4,000 people who said they worked at tech giants such as Alibaba Group Holding Ltd, Baidu Inc, Tencent Holdings Ltd and ByteDance have registered their data.

Employees have since also created separate spreadsheets for specific sectors such as real estate, finance and foreign companies.

A majority of the entries on the spreadsheet show that while a five-day week is the norm, many staffers work 10 to 12 hours a day.

One of the creators said in a post that they hoped the list would be an effective reference tool for workers when choosing jobs.

In another post, the team argued that the “996” practice of working 9am to 9pm, six days a week was rife and working hours at internet firms were often opaque.

“We hope to make a contribution to the boycott of ‘996’ and the popularisation of ‘955’,” said one of the creators on China’s question-and-answer site Zhihu in a post viewed six million times. “955” mean 9am to 5pm, five days a week.

Alibaba, Tencent, Baidu and ByteDance did not immediately respond to requests for comment.

Long work hours are a hot topic for China’s tech workers and others among the young, white-collar class.

The issue first gained attention in 2019, when tech workers launched a similar online campaign against “996”.

In recent months, criticism of long hours has gained traction because of a government crackdown on tech companies that has shone a spotlight on their treatment of workers.

This year, companies including TikTok owner ByteDance, short video platform Kuaishou and food delivery giant Meituan have cut compulsory weekend overtime. China’s top court in August described “996” as illegal.