I'm training for a 10K run in York on the 3rd of August, and have been increasing my long runs by 10% over the last weeks. Today I crossed the 60 minutes threshold by spending 63 minutes on running 9 km. I'm chuffed with that - it's not long ago since the thought of running for an hour sounded absolutely ridiculous to me.
As far as training for a 10k event is concerned, I consider 9km a month before the event must mean I have a really good chance of completing the run. And just completing it is really the main thing. Ideally I'd like to get a time around 60 minutes for the 10k, so I will have to start spending some time on speed training real soon. Fartlek or sprint intervals or tempo running or whatever it's all called. Guess the name doesn't matter much, as long as it involves speeding up.