Has fermentation finished?

[Braumeister]

Is it time for me to transfer to Pressure Barrel now or shall I leave it longer?

It’s only been 4 days. Airlock bubble once every minute. This is the ispindel chart:

 

[Rodcx500z]

Take a hydrometer reading, personally i would leave it a few more days then take another reading, a pb is a bit more fragile than a corny keg

 

[hoppyscotty]

I'd say not yet...Draw a trend line through that curve and its not horizontal. I want to see 3 days at least with no change in FG before I declare it done.

 

[obscure]

While it is certainly possible it has finished fermenting (I use S-04 a lot and it typically ferments out in three to four days likewise with Nottingham) I would still leave it a couple of days, if it is finished it will do the beer no harm and likely let it clear a bit.

 

[Agentgonzo]

Leave it until it's flat for at least a few days.
This was my last plot

 

[Stevieboy]

A bubble a minute - still plenty going on. Don't be afraid to leave it in there, it'll be fine.