If one can cut clean wood, a chain can last longer between sharpenings. However, they can go dull in an instant if they touch a rock or sand. When that happens, stop don't go on any longer, sharpen up and then continue, your saw will thank you and so will your back.
I get my firewood in 10 bush cord loads from the logging truck. It's mostly white birch, often there is sand, dirt and some gravel stuck on and between the logs much of which cannot be seen, and this can really take the life out of chainsaw chains.
Keep your saw clean, blow it out with the air compressor regularly to get rid of the saw dust and crap that builds up in there. This stuff is the death of chainsaws as it prevents proper cooling, and too much in there will compromise the chain oil causing the chain to sieze (usually when you need it the most, like half way into a dangerous tree).
A few sticks each day keeps the fuel truck away.