My LO used to get zero.
At around 15.5 months I started showing her pororo videos on youtube while I showered, in the car when she wouldn't get in her car seat.. and she watched quite a bit while we were traveling alone to CA (4-5 hour plane ride).

Now at 17 months old she begs and begs for it. -.-
I think on average she watches 30 mins a day.
Gonna try to cut it to 15 mins tops!