Hmmm. That is a new feature, and it is a further example of google's use of monitoring one's activities via the location elements of a mobile. Initially it became visible via the daily graphs wherein google would tell the public at what hours different types of places were busy; notably first with restaurants and later with many other types of establishments. Frankly I did find the info helpful one time with regard to busy hours at a market.
And with that one example, I realized it speaks to the "customer utility" or "customer friendliness" that google engenders to the wide public with information of this type. On the other hand if I were a restaurant I wouldn't want this type of information available. Alternatively if I were a restaurant in a competitive area....if I were to review our own busy hours versus those of other restaurants around us...and look closely at them...one thing it might spark me to do is run specials during slower hours. Possibly expand "happy hours" or run some kinds of specials to get people in the door during hours when we are staffed but slow.
I generally don't like it. I don't like that google is taking my location data and then using the data to provide public information. Its without my specific consent. It is with the consent I have to give to use google.
Have you ever turned off the location data on your mobile? I have. The volume of reminders and requests to turn it back on is beyond the extreme of annoying. That should be limited IMHO. Its entirely annoying, persistent, and ANNOYING.
Now they have added this "time spent" thing. Like Egol above I don't like it. I simply don't want google nosing around in my mobile to report or assess anything I do.
Marketers on the other hand love it. One of the developing technologies is for some kind of beacon to assess when you get close to certain stores, and/or where you are in an arena or airport or something like a train station. It will hit you up with ads and purchase opportunities.
The whole thing is an endless commercially driven environment. Too overwhelmingly and endlessly commercial in my point of view.
It would be nice to see the public revolt against these privacy intrusions. I don't see it happening any time soon though. The public loves google.