I vote 1 to 2 years, but 3 to 4 is also possible. Anything longer than that, absolutely not. Zero chance. Coherent videos up to a minute or two long have already been made. Perfecting the technique once proof-of-concept has been achieved is a simpler task than creating proof-of-concept in the first place. It's incredibly, incredibly sad that the people here are so ignorant that "In 10+ years" is the winning vote. This place truly has gone to hell, just as /futurology did years and years ago.