screen time          
noun [ U ] (also screentime) uk/ˈskriːn ˌtaɪm/ us/ˈskriːn ˌtaɪm/
 (电影或电视节目的)屏幕时间
the amount of time in a film or television programme during which someone or something is shown on screen 
  All actors want more screen time. 所有的演员都想要更多的屏幕时间。 
 They spend a lot of screentime establishing that Andrew is a good person. 他们花了很多的屏幕时间来塑造安德鲁的好人形象。 
  (看电脑、电视、手机等的)屏幕时间
the amount of time someone spends looking at an electronic device with a screen, such as a computer or television
  How much screen time do you allow your kids? 你允许你的孩子有多少屏幕时间?每天三四个小时的屏幕时间太多。 
 Three or four hours a day of screentime is too much. 每个三四个小时的屏幕时间太长了。 
 - More examples
 - Famously, the co-stars did not get on so the director tried to limit shared screen time.
 - Even though she doesn't get much screen time, she steals the show.
 - His entire career amounts to about three minutes of screentime.
 - Limit "screen time" (television, video games, computer games) to no more than an hour per day.
 - Sadly, screentime has replaced playtime.