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Just reaiized I've had the same blade for over a year, and I'm wondering if my latest attempts at seam scraping are obnoxious because I hate seam scraping or because I should go pick up a new blade.

Really depends on how often you use it. If you use it on almost a daily basis then you might find it needs to be changed somewhat regularly.

I'm pretty heavy on mine and I change them about every 6 months. They do get pretty dull though by that point.

Really depends one the job at hand; some things really need a brand new edge, while others less so.
I've taken a liking to disposable trim away blades;
http://www.scalpelsandblades.co.uk/accessory-detail_144_swann-morton-trimaway-knives-product-no-9205-or-1801.php
pretty cheap for a bunch of them (the same site is good for regular style blades too)

As often as necessary. It's not in constant use - so when it needs a new one, it gets one.

Blunt blades lead to carelessness and excessive blood loss and perhaps trips to casualty, ER or whatever the trauma centre is called in your country.

You're more likely to apply excessive force to a blunt blade, leading to worse cuts when you do get yourself.

Like the others, as often as I need to. Sometimes I want a blunt blade and sometimes I don't.

Funnily enough, my wargaming injuries tend to pile up when my blades are sharper.

Checking my knife blade logs, I find I change the blade every 27.733 days with a standard deviation of 3.0556 days.

Holy crap... months? I change mine fairly regularly. I find that I get a lot more (and deeper) cuts because of this, but there are some reasons that I have to do it. A sharp blade seems a lot better to use for scoring plasticard. I also work with a lot of restic, which is a general pain in the posterior with a fresh blade and nigh unworkable with anything but. I think the dull blade is a luxury of high quality hard plastic, and possibly metal, for anything else I've just got to have a new blade.

This is more of a recent development, heck, I used to purposely run a fresh blade over a bit of metal to dull it so I wouldn't cut myself so easily. But the materials I'm working with now all but require a fairly sharp blade. I bought a 100 pack at staples

I keep two.

One newer one, that is very sharp - this is useful for certain applications (precision cutting, find details, etc.).

And an older one, more dull - this is useful for more "rough" tasks...where I don't want to remove too much material at once (scraping, etc.).

When the new one gets dull, I put it in the "older" one handle, and throw the old one away.

Yeah, time to get a new blade then. I've been pretty hard on mine and I just never thought of it, as this is the longest I haven't misplaced it and just bought a new one anyway. Don't ask.

 Kilkrazy wrote:
Checking my knife blade logs, I find I change the blade every 27.733 days with a standard deviation of 3.0556 days.

Odd, you might want to get that checked out. Any deviation over 2.5783 is worrisome.

i change it when the blade starts to get dull or when too much of the tip snaps off during slicing. i love that fine needle tip for detail work.

the blades are not that expensive and one pack comes with a bunch. it's a pointless waste of time not to switch them out.

edit: i can understand not being able to afford replacements if you're using the citadel fineknife or whatever it is that they sell.