It really just depends on what you're making, there's several things that will make your time vary:
1. Size of what you're making. Usually, something like a shirt will take a ton of more time than say a bracelet. That much I'm sure is obvious though.
2. What weave you decide to use for your item. Some weaves are very
complex and time consuming.
3. Size of the rings you decide to use for your weave. Some maniacs/masochists make what's called MicroMaille
That tiny little patch probably would take me an hour and a half to make, much longer if I had to make the rings, which is point:
4. Whether you make your own rings or not. Most of the early stuff I made was with fencing wire and copper hanging wire wrapped around knitting needles, I wrangled up at Walmart for cheap. I didn't have a professional set-up though and started opting to buy my rings cut which are still fairly cheap (depending on what metal you use)
5. What metal you use. Some metals are very maelleable, others are very resistant to bending and it takes longer to put a single ring in place; for example, stainless steel is harder to work with than aluminum. There's not a huge
difference between each ring, but when you're working with hundreds of rings, just a second longer can build up quick.
6. Last is just experience and practice at weaving. One thing I really love about making chainmaille is that once you have a pattern down you can just go into autopilot and watch TV or a movie or whatever while making it.
Sorry for the rant....chainmaille will make me do that. >.>
Edit: Reading over my post seemed kind of discouraging, so for the record I'd like to say that most weaves are actually very simple, and if you work with decent sized rings, it goes by pretty quick. The first dice bag in my MAIL profile you can see that is just like Cheez's probably took me 4-6 hours (it’s been years, so I don’t exactly remember) from coiling the wire, cutting the coils into rings, and weaving the bag; and that was with very
little experience. Now that I’m pretty decent at it, I bet I could make a bag just like that one in a couple hours with bought rings