My tablet is two years old and I still have the original nib in. It's a little dull, but it still works perfectly fine. I guess it depends on your tablet's surface and the material the nib is made out of. Some tablet surfaces (the higher end ones) are really silky smooth while some have a slight texture to them. Rubbing the plastic on that can eat it up pretty quickly. My first tablet was like that and my nibs lasted about six months before I had to replace them.
I freaked out when I saw that mine was wearing down, so now I just throw a sheet of paper over the tablet. According to my very scientific measuring process of,"About how much do you reckon it has worn of?", this is working well.
My tablet is about 5 years old, and I'm still using the original pen nib. It's worn down quite a bit, but not yet at the point of needing a replacement. Then again, I really only use my computer/pen for cleaning, lettering, and coloring. ^_^;
Back when I had my old Intuos3, I had it for about five years and I think I changed nibs twice during that time. I've had my Cintiq for a few years now, and I haven't noticed any wear on the nib.
The difference with these is that I switched the standard nib to a harder, grey nib with some sort of small spring inside it. IDK, it came with the thing and it felt better so I use it. The plastic the new nib's made out of seems a tad harder than the regular nibs, and I'd assume the softer plastic wearing out faster. I could be totally off.
I feel like an outlier here for being the only one who goes through nibs like a pencil!
It really depends on what kind of surface you're using. I taped a piece of paper over my tablet surface (Intuos4) for a while, and that wore down my nibs like crazy. If your tablet surface has a very glassy/slick surface, you're not gonna get much wear and tear on those nibs. I never changed my nib on my old Graphire4 pen, for example.
On topic of that tutorial, I actually wrote a review on my experience with the make-your-own-nib. You can read it here.
Location:So Cal is where my mind states, but it's not my state of mind
Good god D: I'm so poor. I have a really gross low end tablet that I got only because it was cheap for its active area and super skinny (Vistablet). It's got a really nice paper texture though so it feels more like traditional, so I go through nibs like crazy. t's only been two years of severely infrequent drawing and I went though three nibs already. They turn razor sharp at that point and start to scratch the surface protector, so that's got loads of marks too. Should get a Wacom at some point. But they're so expensiiive.
I changed it about 3 times in the 11 years I had my first tablet, plus the one that I replaced because I pulled one out and lost it. I noticed that they wore down a lot faster when I put a piece of paper over my tablet.