How dangerous is it to leave a guest network open for say 2/3 hours while I used my DS-Lite. I dug it up recently and upon trying to connect to our wireless I discovered the ds lite is only wep compatible, so I head on over to the router to setup a guest network to use for it and sadly enough I see this
http://i.imgur.com/bxOxp.png
I guess it means this router can't use WEP or something along those lines, so I see my other choice is to leave it unsecured for a while. What real dangers are their to doing this? Do any of you do it?