At what rate does Smoke Dissipate?

[Cloudyshine]

I am getting an Eversmoking Bottle and the rules for at which rate the smoke dissipates is unclear. The specific wording for the item is

Quote:

The bottle must be resealed by a command word, after which the smoke dissipates normally. a moderate wind (11+ mph) disperses the smoke in 4 rounds; a strong wind (21+ mph) disperses the smoke in 1 round.

I can't seem to find any other rules regarding this, so at what rate does the smoke dissipate if there's no wind at all?

[Darksol the Painbringer]

1 minute.

[Cloudyshine]

Thanks a bunch!