Saving geolocation data to session with timeout or better approach?

Hi all.

I have a script that retrieves some location data from google api, and store the retrieved data in a Session (Location). All this is working just fine :) 

(if someone have a better way, better approach to store this data for my website visitors, let me know).

The data is saved to session (as of now), with an ajax call from the script.

example in controller for Geolocation.Lat:

if ($this->request->data['lat'] != "") {

$this->Session->write('Location.lat', $this->request->data['lat']);

}

(the other values are also stored similar; Location.long,Location.city and so on).

Now, I am wondering, how can I set a timeout on the session => Location.*

I want the visitors location data to be valid for, example 1 hour, before requesting new geolocation. 

Any suggestion how and where to store the data (the best approach) ??

Thanks for any input on this :)

-Tom

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