Disclaimer: I know everyone runs at different paces and what is slow for one person is fast for another This is only my experience of my own pace.
My fastest 5K pace is currently 06:20min/km and my slowest long run pace is 08:30min/km. My average long run pace is 07:15min/km.
I plugged in my details to MyAsics to generate a tailored plan for my 10 mile Great South Run (my target time is 01:50:00 and I said I could run 5K in about 33 minutes currently) and it has me starting off for runs of 7K at 9min/km. It just seems quite slow. I am worried if I run that slowly for me I will hurt my knees or something by plodding along! Am I just worrying for no reason, is it even possible to run too slowly? Is this other people's experience of MyAsics... does it work?
EDIT a month later: Just incase anyone sees this post, after running slower for a few weeks now, I can report: no, it doesn't damage you and I definitely recommend it! I am back in love with running now that I'm not pushing myself so hard on every run!