Purchased an Omega 13564 boar brush on sale for $5 from Maggard on Black Friday.
The knot is small (20mm?) but the loft is kind of tall for a little shaving brush and the knot as a whole is very stiff with much backbone (making it good as a hard soap-killer).
3-4 times a week I'd use Conk soap to lather the brush then let it dry with the soap on it then rinse and repeat. Some weeks I'd do it once and during a week or two I just let it sit with the dried lather on it.
And now after 2 months it's sweet. The knot is still pretty stiff with the same backbone but the tips have all split and are nice and soft. Well, soft for a boar.
As I own several other brushes I was fine with the time it took to break it in. I look forward to including it in my rotation esp. when using Arko or hard milled soaps.