Assuming the connection works fine when both devices are near the router, both technically and for what you want to do with it (look, record?) the range depends on the circumstances (like walls in between). In the open air a distance of 50 m between router and device seems possible. Just try with your phone.
I want to connect a a wifi camera to my android smart phone. I have a LynkSys WRT54G router. What kind of range should I be able to get from this setup?