quest diagnostics shift premium/differentials

I am unsure where to post this question because it doesn't seem like quest has their own lively subreddit, but im assuming there's a good handful of quest employees here....what are the times that shift differentials kick in for second shift and overnights? for example, my current job second shift is 3-11pm and midnights is 11-7am. i understand that their premium is 10% for second and 15% for midnights, I'm just looking for the time ranges. TIA