Time Spend on Site from Smartphone vs Desktop

[khi5]

On a website with a well optimized website for smartphones, how long time should one expect the average user spends on the website - from their smartphone - as a % of the time users spends from a desktop. 
Example: if average user spends 10min on the site from a desktop, is 5min (50% of..) a decent number to expect? If anyone has any done any studies or have data on this, would be appreciated.

thank you

[ProductPearson]

It varies massively on the site of course, so I would recommend using Google Analytics to find the answers to these questions, as it will be able to tell you.

In terms of our own site, SearchBuzz, we noticed that the average visit length was longer on the computer. Windows has people on for around a minute, whereas people only managed to stay an average of 30 seconds on iOS and Android. But that's because we are a news aggregator and we send our traffic straight back out again deliberately. This is what I mean by it depends on the type of site you have. A social site or a forum is going to have much longer for both mobile and desktop.

[khi5]

thx, Ashley. I can certainly track mobile vs desktop in analytics. My question centers on whether there is some research out there on time users spends on mobile site vs PC and maybe such studies give examples on different industries. My site's users spend about 7-8min from PC and about 5-6min from mobile……looking for some data to get a sense if my mobile is doing well or could be better optimized…..