I'm a multiple Brooks owner. My oldest is from 1988, my newest from last year (so I've recent breaking in experience).
Don't get me wrong, Sheldon Brown was a genius geek when it came to cycling. But I disagree with his method of breaking a Brooks saddle in. As manufactured, the leather is quite hard and stiff. This is a good thing, once broken in. A soft saddle is less comfortable than a broken in harder one. Too much oil or treatment can make the saddle go soft, so the rule of thumb for me is just enough treatment to repel water and treat the leather. That's every few months application of Brooks Proofride for me.
Breaking in is done with riding. How long that takes depends on the shape of your arse and the particular model you've bought. The B17 I got last year only took maybe 1000 miles to go from normal saddle comfy to leather saddle super comfy.
If you don't manage to break the Ti Swift in to your satisfaction give me an email at Jeffhancox'at'yahoo.co.uk – I want one for my new build Orange R8. I won't be interested though if it's been subjected to either a soaking in rain or an immersion in oil or treatment wax 🙂