it would be impossible. even if there were peers, a peer by definition does not have 100% of the file. you need at least one seed to keep the file alive. essentially it depends on the amount of people sharing, and then we get into something called ratios, which is seeds/peers and a healthy torrent usually has an even'ish amount as opposed to swaying towards either side of the spectrum.
to give you an idea, many tv shows might have 100's of seed and peers, sometimes up to 1000's, even months after it was shown on the air. a popular show that is posted the night it airs can up to 10,000 seeds+ and twice that many peers and those are the files that come down lightning fast. a half hour show is 175 mb~, an hour show is 350~ mb, and movies hover around 700 mb.