Teachers in England are working too many hours, with a fifth working at least 60 a week, a report has warned.
The increasing workload - which see half of the country's full-time teachers working between 40 and 58 hours a week - is leaving them with little time to develop their careers, the Education Policy Institute (EPI) found.
Only teachers in Japan and the Canadian province of Alberta work longer hours than those in England, the study of 36 countries and regions also reveals.
Peter Sellen, EPI chief economist and report author, said: "Longer working hours are also not reflected in teachers' pay, even when considering the normal hours for other workers in our economy."
He added that the "burn-out" effect in England was shown by a sharp fall in the number of teachers over 50.
- Career development
England was ranked 30th out of 36 in terms of time teachers spend on continuing professional development (CPD), with teachers spending just four days a year on it, less than half the average of 10.5 days. In Shanghai, China, staff spent 40 days a year on average on their personal development, the study claimed.
David Laws, the former Lib Dem Schools minister in the coalition government, who chairs the EPI, said:
The EPI report analysed data from the Teaching and Learning International Survey (TALIS), which includes information from more than 100,000 teachers collected between 2012 and 2014.
It found that 60% of teachers in England said their workload represented a significant barrier to accessing professional development, placing the country seventh highest out of the 36.
Angela Rayner, Labour's shadow education secretary, said: "While the Tories waste time on bringing back failed old education policies, they are ignoring the most important factor in delivering an excellent education for all - great teachers."
Chris Keates, the general secretary of the NASUWT teaching union, added: "This is another report to add to the already overwhelming mountain of evidence that teachers' professional lives are blighted by an excessive workload.
"Year-on-year increasing numbers of teachers leave the profession and potential recruits are deterred from joining it because of the toxic combination of increasing workload and decreasing pay."
A Department for Education spokeswoman said: