Help on a hotspot setup to monitor kids

My home none wireless router is setup to DHCP ( 192.168.55.100 – 192.168.55.150 ).
I have a 750g plugged in to one of the ports. (ether1 on the 750g)
I then have a Wireless AP plugged into the 750g.(ether2 on the 750g) ( Linksys AP factory defaults)
I would like to setup up a hotspot that logs who has used it and for how long.
I would all so like to know if possible how much bandwidth has been used or at least how much has been downloaded.
This is for me to monitor how much my kids are online. I may would like to put a time limit on them.
Is this possible? Would I need to reset configuration on the 750g when I first log into it and then try to setup hotspot?
Is there a script out that someone might want to share? If so thanks.

you can try to look in the manual:

http://wiki.mikrotik.com/wiki/Category:Manual
and some use rgenerated contents:
http://wiki.mikrotik.com/wiki/MikroTik_RouterOS

there are many ways to do what you want to, like with hotspot by time limiting the accounts, or through firewall filters setting up time limits just name the few.