It depends on the size of your bottle of wild Alaskan salmon oil.
Here is how long 1 bottle will last depending on your pet's weight and daily dosage.
Pet weight 8oz Bottle 16oz Bottle 32oz Bottle
0 to 12.5 pounds ~6 months ~1 year ~2 years
12.5 to 25 pounds ~3 months ~6 months ~1 year
25 to 50 pounds ~6 weeks ~3 months ~6 months
50 to 75 pounds ~4 weeks ~2 months ~4 months
75 to 100 pounds ~3 weeks ~6 weeks ~3 months
100+ pounds ~2 weeks ~4 weeks ~2 months