As everyone else sayes it depends. For me personally it took quite a few weeks. Some days were better than others. I got hit by a car (before I used to wear a helmet, but we’re not entering that debate). It was the flash backs of the accident I found worse, trying to picture what happened what went wrong.
Never been the same since, if anything I’m better than before. It made me reflect on life a lot. Quit my old raving days/drugs etc, got a proper girlfriend, went to Uni after working for years as an office temp, got BSc a Msc. Life couldn’t be better. Though odd things still can trigger memories of the accident and I still don’t know what really happened that day.
It’ll take time, just don’t rush it