Annie--I would say take 3 months to build to the 10k. You could do it faster, say in 2 months if you really wanted to--depends on how motivated you are. Increase for three weeks, then have an easy week followed by 3 more weeks of building, rest week, etc.

Today was hill-repeats for me. There was a huge red blob on the radar just off the coast when I went out, so I kept it short.

Hill-repeat question: What kind of hill (%grade, distance) is good for hill repeat training?