The Chinese version of the popular short video app TikTok, known as Douyin, will limit users in China who are under 14 years old to 40 minutes a day, parent company ByteDance said in a blog post Saturday. The app’s youth mode keeps it in line with the Chinese government’s new restrictions on access to video games for younger children. Teens under 14 will be able to access Douyin between 6AM and 10PM, but won’t be able to use the app outside of that window, the company said. The rules will apply to “real-name authenticated users” under 14, and the…