Just like all typical breakages it’ll take 6 weeks to heal fully.
The 2 weeks of sling use will be to try reduce any swelling and to help the initial knitting process happen. Your body will try to form a blood clot in the holes over which the new bone tissue will form. If you keep moving about you can dislodge the clot making it harder for the new bone tissue to grow. It’ll still grow but take more time.
regarding the numbness, this is because nerves are cut during the surgery. Some nerve tissue growth will happen but the sensation won’t ever be like before. The more you cut the more scar tissue you’ll have and more numbness. massaging the area regularly can help encourage nerve tissue growth.
I’m not a doctor or medically trained in any way but I have broken many bones, with the last one being a collar bone which needed screwing and plating and I like to ask a lot of questions so I’ve picked up some knowledge along the way.