Yep. Japans declining birth rates and aging are working against it. They’re trying to keep up with current output with a smaller population. China will be facing something much worse because it struggles to attract immigration to offset population decline and will likely follow the same steps - increase hours to maintain output.
207 Hours Overtime: Japanese Man in Kobe Worked to Death ( unseen-japan.com )
A medical resident worked 207 hours of overtime in a month. His case highlights Japan's continuing problem with karoshi - death by overwork.