SanDisk Memory?

I am starting to film me skating and I have a 4GB Sandisk in my camera right now and I only have 12 m of HD recording time. What memory card do I need to get more HD Recording time? I bought a 32GB Sandisk Ultra and it says I only have 12 m which is the same as the 4GB which doesnt makes since. Please HELPP!!!

you should post this in the professional cards board. 

that said it is probably a limitation of the camera. some cameras limit the length of video. i would check with the camera manufaturer to check on its limitations.