I'd say 1.020 is reasonable. no need to wait til you bottle it to run a hydro test. remember, airlock bubbling does NOT equal fermentation
I've had plenty of things bubble for a month when the gravity never changed. I've had things never bubble, but the gravity fell 80 points.
Hydrometer is the only thing you can trust.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10