"much faster" is ambiguous here. Ride 150 miles a day every day for a week, don't over-eat, and you will lose much more weight than you ever could from HIIT. On the other hand, that's a lot of hours, and HIIT will easily win in terms of weight-loss per unit time.
The ambiguity is what unit of time you care about. With HIIT you lose more weight per minute of exercise you do. With a lot of LISS you can lose more weight per week than you could with HIIT.
Understood, but the parent I responded to was talking about efficiency so I thought that was the context.
In my experience I'm not so sure about that either. I can't repeat centuries day after day when I am out of shape and need to lose weight. If one can, it's very unlikely he/she needs to lose weight.
