about a week i think but it may not be accurate
Take it for dry cleaning...
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Apply saddle soap or similar conditioner to the jacket and let it dry overnight, then take mink oil and apply that over the jacket, this should restore the suppleness to the leather, aswell as restore some color to the jacket.
I wouldn't. Leather doesn't take well to washing. Better off taking it to a leather cleaner at the dry cleaner's
The average cost for a leather flight jacket would be $40, give it or take. Still, there are a lot of aspects to consider when looking for a leather flight jacket: brands, materials used, new or used, vintage or more new age style.
how long
If you take care of the leather, keeping it clean with Saddle Soap as needed, and don't skid down the highway on them, they should last long enough to pass on to your heirs. My jacket is about 50 years old.
how long does it take to cook a ten pound meat loaf
how long does it take to roast a leek
There are different categories of the term 'used', it might be something that has been in the attic for years, it might be something from a famous movie which can cost $$$, or it might be 'upcycled'. Upcycled leather jackets are made from 'used', discarded leather materials such as from an old leather trench coat. The nice thing about upcycled leather jacket is that it isn't technically worn by anyone yet, but the material used is old. Take a look at 'used' upcycled leather jackets here for more ideas: https://olgaroad.com/
After the village scene, Leon's jacket seems to mysteriously vanish. However, if you take on Ada's side-quest afterwards, you will see that one of the Ganado villagers are now wearing Leon's jacket.
It takes hundreds of years.