Trying to understand travel time in iOS Calendar

Question

I could be wrong, but I thought Maps/Calendar in iOS 7 was supposed to figure out how far you were from the location of an appointment and calculate an alert based upon travel time, so if you had a 7:00 appointment and you were 15 minutes away, you'd get an alert at 6:45.
If so, how do I get this to work...or am I mistaken?
Thanks!

Answer 1

I am still confused since looking at the output of
$ sudo systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
graphical.target @12.315s
└─multi-user.target @12.315s
└─postfix.service @12.029s +285ms
└─network.target @12.026s
└─NetworkManager.service @3.926s +221ms
└─basic.target @3.916s
└─timers.target @3.915s
└─systemd-tmpfiles-clean.timer @3.915s
└─sysinit.target @3.911s
└─systemd-backlight@backlight:intel_backlight.service @3.908s +3ms
└─system-systemd\x2dbacklight.slice @3.907s
└─system.slice
└─-.slice
Seems to indicate that the graphical.target comes alive at 12 seconds - yet the login prompt on the graphical screen is visible at 7 seconds!  I could believe that after the login prompt the network may still be being initialised, but something still doesn't look right compared to the elapsed time for the graphical target.