It took us about 4-5 hours to summit from the lakes, the down hike was ~2.5 with a few longish breaks. Had we taken the rocks up, we would have shaved at least 1/2 hour off compared to the scree slog we did.
We hiked from trailhead to the lakes in just over 3 hours FYI 7am-10:15am or so). Left the lakes around 11am-ish give or take and summitted around 3:45p (3:00p for the fastest in our group - but he did take a 15-20 min nap at one point)we spent somewhere around 20-30 mins on the top and were down to army pass within about an hour and a half from the summit. We were back at camp a bit before 7pm.
If I had to do it over again, I'd summit on day 2 rather than on day 1 of an overnight backpack, the hike out from the lakes is quite easy. That slog up the scree (the unavoidable part before the boulder/rock section) is HARD in my opinion - coming down ain't so bad but going up feels like two steps forward one step back...
