I recently switched from a Selle Royal Seta T1 saddle to a Shimano Pro Falcon Anatomic saddle with a cut-out. It's lighter, wider (152mm), and has lesser padding than my previous saddle. The first ride I did with it was 100-km ride, in which I was on the saddle for around four hours. Apart from pain around the sit bones area, it was comfortable. To date, I've ridden 163km in total on the saddle, so three times in total, but every time I have ridden it, my sit bones have hurt.
I am wondering in general how long does it take for a saddle to break in, so to speak. Or, is this a case where this particular saddle isn't right for me?
I'm a heavy rider at 88kg, and I ride mostly in the saddle. I chose a 152-mm wide saddle because it more closely matches my sit bones measurement, which came around 15cm.