Spotted a useful bit of research from eMarketer earlier in the week that looks at how long UK consumers spend on different media types each day.
The big headline is that the rapid growth in use of mobiles means time spent consuming content using digital devices now exceeds the time spent consuming content via television:

 
The research counts time spent using multiple channels simultaneously separately – so an elapsed hour spent dual screening between TV and online counts as one hour for each channel.
You can find more details on the research findings and methodology here.