Bandwith requirements? (Score 1)

For the life of me, I can't seem to find any information on how much bandwith is needed for video conferencing? Anyone have a guess to how much bandwith is needed for video? So I'm guessing this isn't based on H.32x protocol? The reason I ask is because other countries definitely work on limited bandwith, with 56k being the norm. My friend wants to video conference yet is unsure about how much bandwith would be used over an hour of voice and audio.