I've got "Partner" saw. When chain is new, and you work carefully (do not cut into soil) it will work long time without sharpening. I would say, that chain without additional sharpening can cut up to 10m3 of wood, but, you never know.
I see. I've got a Stiga saw, which is made in China and probably like most of the others with a membrane carburator etc.
They key thing, I believe, is the chain sharpening. Some people use an electric tool, but I have been guided to use manual sharpening whenever possible, as this does not heat up the elements of the cutting chain.
I have bought a sharpening file which has an indicator bracket for using the right angle (30 deg). (Here's the English language again - right angle doens't equalt 30 degrees, I know I know. But it's not my language...)
Mine works fine, but I am still trying to find my way around the chain-jungle.