I am impressed by folks who are creative. Will this be a viable product? Who knows. Maybe yes, maybe no. Up here a number of years ago they were making furnace fuel bricks out of sawdust from local mills. The sawdust was delivered by truck and stored loose in the basement. Bricks would be made and then stored to dry awhile prior to burning. Each brick probably gave up 1/2 hour of heat ... the loose sawdust however was a bit of a risky idea. It worked for a while.
Two hours burn time isn't too bad ifn you really had the time to make the logs.