People have different views about whether it is the content of TV programs or the length of time spent on watching them has more significant impacts on children. While the amount of time devoted affects preschoolers, I would argue that content viewed has a more marked influence on them.
On the one hand, the consequences of watching TV for long periods could be detrimental to the youngster. Firstly, the longer the children are exposed to programs broadcasted, the more likely it is for them to be addictive over time. If children are too over-reliant on TV for entertainment, they might neglect the outdoor activities, resulting in a sedentary lifestyle that is highly harmful to their physical health. Secondly, excessive time for TV watching would impair the children’s communication. For example, if children spend too much time in front of the TV screen, they are discouraged from interaction with others. Gradually, this habit would exclude them from their social lives and hinder their development of living skills as well as mental health.
On the other hand, I strongly believe that the content shown on the screen have the most direct effects on the behavior of young viewers. The broadcasted images from TV could present inappropriate materials for teenagers such as violence, sex, and abusive language. When youngsters are unable to distinguish between the right and wrong at their age, they tend to adopt improper behaviors seen on TV. For instance, scenes of violence in movies typically showing poor examples for manner could make these adolescents fall under the impression that brutal and fighting is the feature of manliness and charm, later ending up the potential risk of committing a serious crime in the future.
In conclusion, while time duration for sitting behind the screen has its own implication for children's behaviour and personality, it seems to me that the factor with more considerable impacts on shaping a child’s value is the content. 
 People
 have  
different
 views about whether it is the  
content
 of TV programs or the length of  
time
 spent on watching them has more significant impacts on  
children
. While the amount of  
time
 devoted affects preschoolers, I would argue that  
content
 viewed has a more marked influence on them.
On the one hand, the consequences of watching TV for long periods could be detrimental to the youngster.  
Firstly
, the longer the  
children
  are exposed
 to programs broadcasted, the more likely it is for them to be addictive over  
time
. If  
children
 are too over-reliant on TV for entertainment, they might neglect the outdoor activities, resulting in a sedentary lifestyle  
that is
  highly
 harmful to their physical health.  
Secondly
, excessive  
time
 for TV watching would impair the  
children’s
 communication.  
For example
, if  
children
 spend too much  
time
 in front of the TV screen, they  
are discouraged
 from interaction with others.  
Gradually
, this habit would exclude them from their social  
lives
 and hinder their development of living  
skills
  as well
 as mental health. 
On the other hand
, I  
strongly
 believe that the  
content
 shown on the screen have the most direct effects on the behavior of young viewers. The broadcasted images from TV could present inappropriate materials for  
teenagers
 such as violence, sex, and abusive language. When youngsters are unable to distinguish between the right and  
wrong
 at their age, they tend to adopt improper behaviors  
seen
 on TV.  
For instance
, scenes of violence in movies  
typically
 showing poor examples for manner could  
make
 these adolescents fall under the impression that brutal and fighting is the feature of manliness and charm, later ending up the potential  
risk
 of committing a serious crime in the future. 
In conclusion
, while  
time
 duration for sitting behind the screen has its  
own
 implication for children's  
behaviour
 and personality, it seems to me that the factor with more considerable impacts on shaping a child’s value is the  
content
.