I'd guess 10 minutes up to an hour on modern hardware, say a new mac studio. That would be in lightroom - I'm guessing they're using optimized software for this

I'd guess 10 minutes up to an hour on modern hardware, say a new mac studio. That would be in lightroom - I'm guessing they're using optimized software for this though. Taking the actual pictures takes at least couple minutes. The Sony A1 can take 50mp shots at 20 fps - pretty amazing. That's (conveniently) 1 gigapixel per second. So minimum 2 minutes to capture this entire image. Add at least a second between shots for the robotic housing and we're talking 4+ minutes. Could certainly be used to capture most of the faces in a huge crowd.