There's an interesting video on LTT made by one of the editors showing his workflow. It's roughly four hours long, if I remember right. I think they've said that a typical 10-12 minute video takes several man days to produce, including research, writing a script (yes, everything is scripted, even it if looks candid), setup, lighting, filming, shooting B roll, recording product placement, and editing everything (color grading, text and graphics overlays, etc.). They typically have 3-4 such videos in production at once, just for their own content.
LTT presents and image that very finely tuned to their target audience, providing a very consistent platform for advertisers and other sponsors.