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Any idea how long the hike is from the portal to Trail Camp?

The trail is divided into five sections, starting at Whitney Portal, 8,200 ft
3.3 miles, 10,000 ft, Lone Pine Lake
4.8 miles, 10,700 ft, Mirror Lake and Outpost Camp
6.5 miles, 12,000 ft, Trail Camp
8.8 Miles, 13,600 ft, Trail Crest
10.8 miles, 14,500 ft, Mt. Whitney

That's what I measured, starting 0.25 miles from the trailhead where I parked. As of 4/25, no snow to Lone Pine Lake, spots of snow to Trail Camp, no spikes needed, just trekking poles. Above Trail Camp, you'd want crampons and ice ax. I did not get past Trail Crest. I would think 2 hours from Trail Camp to crest, and then another 2 hours to summit based on the snow still there.