The quality vs. quantity equation
If you want to run well off the bike, be bike fit. No amount of run training is going to deliver a great run for you in a triathlon without fully considering bike demands. Too often triathletes expect run training without sufficient conditioning work in the saddle to deliver a great run off the bike. Three-time ITU world champion and great runner Peter Robertson said he never fared well in major races when he was super run fit, but he ran great when he was bike fit. The idea is to be fitter than the bike ride requires in order to buffer your ability to run.
Then run training is all about quantity of quality. This “quality” has many components.