Hi I would like to create to wireless networks from my visor 2830. 1 for my wife and I and 1 for the kids. I would like to turn off the kids wifi at specific times. is this possible?

Looking the latest firmware 3.6.8 at my 2830 no is not possible
Latest models have added an option to turn wifi off at specific times, but not yet for the 2830 (not sure if)
http://i1167.photobucket.com/albums/q631/babis3g/station%20control_zpslfxcdgqd.png

Is not the same but you can try with Wireless LAN >> Access Control in the white or black list if helps
or bandwidth limit via time quote
http://www.draytek.com/index.php?option=com_k2&view=item&id=5277&Itemid=293&lang=en