The water bath canning times are variable based on the recipe and the size of the jar. However, there is a general rule of thumb for elevation/altitude adjustment: 1001-3000 feet = increase by 5 minutes, 3001-6000 feet = increase by 10 minutes, 6001-8000 feet = increase by 15 minutes, 8001-10,000 feet = increase by 20 minutes.