You may want to have a look at this thread as far as connected users and monitoring is concerned.
Kid control and measurement.
You set the schedule at what rate the measurements need to be saved.
Possibility to save your file to flash (or external drive if your controller has USB port).
http://forum.mikrotik.com/t/per-ip-wan-traffic-statistics/157975/1
For complete measurement, search for user Jotne’s creation, he has a solution using Splunk but that might be overkill ?
http://forum.mikrotik.com/t/tool-using-splunk-to-analyse-mikrotik-logs-4-0-graphing-everything/153043/1