As my runs (both road & trail) are getting longer (now between 45 & 55 mins), I've noticed my knees are routinely aching which is something I'd not experienced during my C25K days.
I saw a post from one person saying they were cutting down to two runs per week (from three) for much the same reason and I think I'll do the same once I've hit the one hour mark. I have no HM aspirations, just to keep my aerobic fitness up and help fight the flab. Do 2 x 1 hour sessions equal or surpass the benefit of 3 x 30 mins sessions we ask ourselves? My concerns are really about maintaining motivation with just a couple of runs every week versus looking after my joints which, for 62 years, haven't given me problems until now!
Are all you "Bridge to 10k" folk three + runs a week peeps?