Dr. D,
Should be no problem!
We were up last weekend with a Scout Troop(camped at High Creek Saturday night) Summit Sunday at 7:30; left H. Creek at 5:00am.
We use it to train for Whitney as a day hike. Being it's in our own backyard; so to speak. I would have to disagree with the physicslord
on one point
and Doug from the Whitney Portal Store has stated
the same thing many times. "Hiking in the Sierra's is easier because of the footing!" If you think about it for a minute it makes perfect sense. Down here we don't hike on solid granite very much. We slip, slide and grind as we gain elevation. Up there, you plant and your footing is very stable once you do. To that end, I've found Vivian Trail to be much more of a kick in the pants than Whitney's Main Trail or most Sierra trails. Others might disagree- (I like Germany cars-You like American cars) Just an opinion, nothing more.
Vivian offers a jolt, right out of the car once you cross Mill Creek and make it to the Wilderness sign. Not to mention, High Creek to the Summit.
Needless to say, my advice(If the weathers nice) start early. It's a south facing trail "SUNNY SIDE up" and above the tree line, it was very cold at the top. We lasted a little over 10 minutes with the Scouts and headed back down.
Hope this helps,
Be Safe-Be Prepared.
Keep us posted.
Felipe de España