I think the coordinates for this campground are off, it's located closer to 36.563093,-118.279422

We hiked Mt Whitney from the portal campground in two-days, with one overnight at trail camp. Even with the permit system, the campground was packed, it was hard to find a spot for our tents. We arrived to the campground around 4pm, so I would suggest starting the hike earlier (we started at 10am) if you want a better spot. Another downside of how many people go through the campground, was that it smelled like pee in a few areas, and I was very disappointed to see people had left trash and even wagbags.

The 360 view around the campground is magnificent, and it is breath-taking to see the sunset and sunrise. Don't expect to sleep much in-between though, because you're sleeping on rocks, and hikers start/finish at all hours on the trail that's a few yards away from many of the tent spots.