Ken Nagrod said:
The Dyson supposedly lasts only 15 minutes in regular mode and 5 minutes on turbo max mode with a 3 hour recharge time and only 1 battery included. I don't think they thought that one through, well.
I think that's a little unfair - now I come to think about it, those timings are probably correct, but it isn't designed for continuous use, it's designed for general cleaning. I think for that use it's a good compromise in terms of time/power.
It's a bit like complaining that the cordless carvex doesn't have a long enough run time. Depending on how hard you pushed it, you'd probably get between 5 and 15 minutes of run-time on that - but that might be a full day's use for some people. If you want to cut shapes in plywood with a jigsaw for 8 hours a day, then the cordless carvex won't do it, but that's not because the tool is crap, it's because it's the wrong tool for the job.
I doubt you'll see any cordless vac that'll run for more than 15 minutes on a single charge. And, if you do need extra run-time,you can buy additional batteries at a fairly reasonable price.