You may wish to print out a copy of this time log and record your own times. It would be great to see some other results posted on this forum. Ascending Mt Whitney in 7 Hours 10 Minutes Elevation, Distance, and Time by Landmark Altitude Leg Cum. Mile Time Cum. With any moonlight a flashlight may not be necessary.
Light sticks are good or a small penlight flashlight also works well.
The trail is well established and is easy to see. The trailhead is east of the Portal Store and about a mile up from the Whitney Portal campground. If you start out as suggested above, you will get a beautiful sunrise somewhere around Mirror Lake. By the time you reach Trail Camp, you will find overnight campers awaking to start out on their ascent, also. The good news, unlike them, is you did not freeze the previous night and you do not have to carry a heavy back down later that day.