Current run times for the better cordless stick vacuumsare still waaaaay under four hours. The latest Dyson models will last 60 minutes like thefunu said, but that is in the least powerful setting. Depending on what is being cleaned, you may be able to use the normal cleaning mode and get by.
Probably as important is recharge time. From what I found both of the V11 models run for up to 60, but for a full charge (assuming from empty).
If you are considering the Dyson V11, there's two models, the Animal and Torque Drive. When looking at the V11 Animal or Torque Drive, you're looking at the same vacuum. They both have the 60 minute max run time, recharge in 4 hours, same motor, etc.
One other thing to consider with a cordless is how long the battery will go for. Dyson STILL doesn't have a removable battery, so you cannot jus switch the battery out and keep going... You have to charge the vacuum itself
The only thing that is different is which attachments that are included.
My $.02: With a V8 Animal at home, which is showing a bit of age, but still a pretty good Dyson, I don't know if a cordless is ready to be part of a pro's toolset.