Slow air-lock bubbling can continue for an extended period of time in the perfectly sealed fermenter.
Ascertain the correct time at which the bottle by either using your hydrometer or alternately by the visual signs.
Don’t use the air-lock to determine when to do anything.
Home brewers all too often leave the brew in the fermenter too long because of slow air-lock bubbling.
Brews spoil fairly quickly if not bottled/kegging at the correct time.