Pressure on your sit bones hurts at first but if your weight is balanced properly on them, your tissue adapts and the pain tends to disappear with regular riding.
Pressure on your soft tissues never fades away and in fact can get worse over time and actually damage your nerves there.
Every Spring my first few rides cause my sit bones to feel SO sore...but after a few rides all pain is gone and I feel great for the rest of the year's riding.