Calizephyr - yes I used that strategy also and it worked for a time. I also used a timer to illustrate to him that it didn't take as long as he imagined it would. I'd have him estimate how long he thought it would take - he'd usually say an hour, then I'd start the timer and he'd get to work, only to find it took 10min instead. That too worked for a time. The school has requested I give him external rewards, which I don't use very often, for doing homework. I'm trying that and it is working ok for now.
