I've been cooking a long time and IME there's about a 95% chance that a recipe billed as "15 minutes" is only actually 15 minutes if you don't start the timer until all the veggies are processed, all the equipment is out, and all the ingredients are measured.

Almost always the actual time for "15-minute meal" is 30-40 minutes—sometimes even longer. Not counting stuff like clean-up (any that you can't accomplish via clean-as-you-go, anyway) or shopping or any of that, just the actual time between "I have all the stuff I need for this recipe and am going to make it now" and "OK it is ready to eat".