Hi - it's been awhile. I took two months off - one month during which my cracked kneecap was still painful, and one more month for the healing process to hopefully complete.
It seems as though it did, as I began running almost two weeks ago, and have been pain-free. Started with just 30 very slow minutes a day, then tried two runs of 50 minutes and last night did an interval workout (!). The pace was still quite easy - 5 mins. per km - but was quite a bit faster than I had been running.
No pain at all, so I'll continue building up gradually and hope to be in some kind of shape two months from now. I entered a 10K race on April 29, so that's my target for being able to run 10K without embarrassing myself.
1 hour ago