Fwiw I had a Brett saison I recently did and it went all the way down to 1.002, in wild brews it says Brett is almost 100% attenuative and could take upwards of 8 months to finish. If your going to bottle I would maybe drink them reasonably soon or to be really safe bottle in the thicker Belgian bottles.
Funky Onion Brewing est.2010
Primary-Turbid mashed Lambic
Secondary-Burley whiner American barleywine
Primary-A dark German lager or a Hoppy Munich Helles