Welcome, welcome. Thanks for keeping up the conversation about your new kit. So long as you throw that packet in the freezer, and try to keep it sealed, frozen, it should last you 300 lbs of meat for 6-12 months.
Here is what the starter culture manufacturer tells us about the viability of your Bactoferm:
“In general freeze dried products are microbiologically stable, due to the low water content, and therefore Chr. Hansen’s freeze-dried microbial food cultures are shipped at ambient temperatures. However shipment at 15-30oC (59-86°F) should not exceed 10 days, as this may compromise product quality.
If the cultures are stored as recommended, at -18o C (0o F) or below, Chr. Hansen guarantees a shelf life [of 6-12 months].
A change in the color of the product (to a slightly brownish hue) does not affect the performance of the culture. Nor will it have any effect on the color of the final product.”
Hope this reassures you!