Thank you for the fast reply sungod! 🙂 What I mean by connection time is the time each user spend connected in my Wi-Fi network (not inside my building even if it is connected or disconnected). Using https://developer.cisco.com/meraki/api-v1/#!get-network-wireless-client-connectivity-events call through assoc and disassoc events and timestamps seems the best right now... but I think that it can take a lot of time to get and process the retrieved information...
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