When you swipe down where it says "Today"Control Center wouldn't tell you this
Does adding it to the calendar speed up the process?If you are referring to how long it will take before the iPhone will start showing you this information, I found it to be roughly 2 weeks. The iPhone needs to learn your patterns, i.e.. what time you leave for work each day, when your appointments are in your calendar, etc. I placed my work schedule as a recurring event into my calendar to try to help it understand my patterns.
Does adding it to the calendar speed up the process?
I agree with this.It seems like my iPhone 6 used to tell me about traffic updates on my commute more often but I rarely get updates any more. Did they enhance this feature with iOS 9, or am I confusing it with something else?