Jason,
Although I didn't mention it before, it seems that this hacksaw doesn't lift the blade on the return, non cut, stroke.
So when the first end wears out, (it only strokes half the length of the blade), turn it around and use the other end.
I would expect a blade to last at least a year, maybe a lot more, depending what you are cutting and how often. Mine lasted over 2 years, with a fairly heavy cutting regime, and even then it wasn't completely knackered.
I just hope that you think you have made the right choice.
BTW, I did make another mod that I forgot to tell you about. Mine came with brass grease nipples, which I hate, because they can snap off fairly easily, especially if you use a good gripping grease nozzle. I fitted mine with steel ones, just for peace of mind.
Bogs