When you shop for furniture, car, clothes does your decision determine to buy for quality or for quantity. You probably go for quality.
That is how you should determine your workouts especially when you are short time. This has been a crazy week with work and appointments for me. Knowing I have half marathon at the end of the month, I put running before my swim and bike. But I made sure the run workouts are quality then have swim and bike be the recover workouts. Quality run workouts: 1 workout focus on your form; 2nd workout focus on hills and leg speed (cadence); 3rd workout focus on the endurance, the long run.
When you focus on the mileage numbers (quantity) then you lose focus on the quality, the purpose of the workout. As a triathlete, this can difficult with 3 different sports. Then ask yourself what is your ultimate goals of your races, which quality will be first.