The frequency of these runs will depend on the inidivual's other activities. Note that there is no need for Learn to Train athletes to monitor their heart rates. Athletes can use a variety of techniques to know that they are going at the right pace or not worry about the exact pace or level of exertion. The important aspect is that they get used to going for runs as a method of training.
No relevant resources have been linked to the skill or practice "Periodically going for a steady paced run in heart rate zone 1 or 2".
Skills & Development Database