Interesting fact: the first time I EVER ran a full 5k in training, I finished in 28:30. My goal at that time was to run 30mins, I estimated that I'd need something short of 5k and when I finished the 5k run I was quite pleased, but also a bit disappointed because up to that point I STILL hadn't run 30mins without stopping!
Hmm. I've made a deal with myself. If I start doing leg-strengthening exercises today or tomorrow, I can go for a short run the day after. Ligament is less damaged than the last time.