2/15/2012 12:02 PM
Something isn't right there. I have worked with enough tree companies, and cut enough trees myself, to know that if you take care of a chain it should last a hell of a lot longer than 5-7 trees (even if they were redwoods).
If the operator on the saw isn't hitting the soil with the chain, which would take chunks out of the teeth, you should be able to give a touch up half way through a tree, and then sharpen on the machine at the end of the day. If this is followed a chain that is used all day, every day, should easily last 3-4 weeks.