I don't really remember. 8 months, not sure there, I would pitch some sac, bugs are probably ok.
Ya I have been having difficulty finding information if brett has similar viability shelf life to sac. I was hoping not to pitch sac for this beer and just use the bret to ferment as my plan was to primary for 1 to 2 months then secondary this beer for i could rack some fresh wort on top of the brett/lacto yeast cake to get another sour beer started.