My understanding was that moderate (<1-2hr/day) use of these technologies is endorsed by the American Pediatric Association as long as the child is over 2yo.
I wouldn't say endorsed. Two hours is their absolute max for all screen-based media. If you read the recommendations, they clearly would rather it were less.
That said, I actually think the kind of use you describe is okay. However, few families actually follow those guidelines.
"Today, 8-18 year-olds devote an average of 7 hours and 38 minutes (7:38) to using entertainment media across a typical day (more than 53 hours a week). And because they spend so much of that time 'media multitasking' (using more than one medium at a time), they actually manage to pack a total of 10 hours and 45 minutes (10:45) worth of media content into those 7� hours."
--from a Kaiser Family Foundation Report from 2010. It's probably more now.
http://www.kff.org/entmedia/upload/8010.pdf
