I got my first Pfizer dose a little over a week ago - how long does it take for the swelling to go away?

As stated in the title, I got my first jab a little over a week ago. As expected, my arm got a warm red bump and soreness as my immune system flooded the area. It's now been almost 9 days, and even though the pain is completely gone, the warm bump is still there. How much longer does it take before the swelling goes down?