I find it helps to break traditional “Easy runs” up into 2 categories instead.
Regeneration Runs: 60-65% of maximum heart rate or Lactate Threshold pace x 130-135%
Easy Runs: 65-70% of maximum heart rate or Lactate Threshold pace x 125-130%
if you have 2 days between hard stress workouts the first day may be a Regeneration Run and the second day an easy run.
This would put a 16:30 5k / 34:30 10k runner with a 5:45 pace Lactate Threshold doing a regeneration run at ~7:28-7:46 and an easy run at ~7:11-7:28 pace
Recovery day 1 may be a 30-45 minute regeneration run and day 2 might be a 45-60 minute easy run.