oh yeah, are you using it for a still image?? or animated?

If its a still image, you wont have no problem. If its animated, then the render time clocks up.

Other factors clock up your render time to. i.e depends how realistic you want it. You go for basic low quality small - ish geometry and your laughing. You go HOLLYWOOD and want a high quality rendered finish and you got a lot of render time on your hands.

How powerful is your p.c?
Im using a 1GB RAM with alot of other programs installed and mine is ok. could be alot quicker but im happy at the mo.