How long does it take for smoke to dissapate?

[Rogue problem]

I was curious about using smoke sticks. They put off smoke for 1 round filling a 10ft. cube, but after that, how long does the smoke stay around offering concealment? The book says certain high wind conditions get rid of it faster but if there is no wind how long is the smoke there?

 

[Pinotage]

It's probably fair to treat it as a small fog cloud, as per the spell. So a moderate wind will disperse it in 4 rounds, a strong wind in 1 round. For a light wind, one would imagine something like 10 rounds or a minute. If there's not wind, it will probably eventually settle out, but that'd take several minutes, I'd think. On the scale of time in a combat encounter, if there's no wind I'd imagine it would last the entire encounter.

Pinotage