Doesn't really matter. My point still stands. I think it's perfectly fine to run multiple T workouts per week, even at low mileages (and certainly well below your idea of 70-80 mpw). If you run them at the proper pace, it's certainly possible to double. But if you overcook the pace, you'll be too tired.
And if you can't bounce back from a Daniels T workout in less than 48 hours, then you are definitely running too fast.