I'm not doing PHM, but last race season I did 5 halfs in 5 months, starting with W&D, and had 4 weeks between each race. I did a 4 week cycle between each:
Week 1 (immediately following half #1): short, easy recovery runs with a "long" run of 4-5 miles
Week 2: back to my usual mid-week running with a long run of 10 miles
Week 3: same + cut back long run of 4-5 miles
Week 4: taper - shorter distance mid-week runs, followed by 13.1 race
The key to not getting run down was that only ONE of those races was run hard for time.
Thanks! I lied, it's 5 weeks in between now that I looked closer but I'm thinking something like:
Week 1: 2 miles, 2 miles, long run of 4-5
Week 2: 2 miles, 2 miles, long run of 10.0
Week 3: 2 miles, 2 miles, long run of 4-5
Week 4: 2 miles, 2 miles, long run of 8.0
Week 5: 2 miles, 2 miles, 13.1 Race
(the 2 mile runs are my current 30 minute run time on my treadmill. Could change to longer if my speed gets better.)
Then jump into Princess training on Week 9, which has a 4 mile long run.
Vary similar to PrincessV's recomendation.
Use the reverse taper at the end of that program. Then counting back from the next race, long runs something like 11, 6, 13(race). Is there enough time in there? After Princess, if you want to get faster, I suggest concentrating some of your annual training to 5k - 10k specific training. Fast marathoners come from fast 800 meter runners. You can get to the same place with a ton of volume but it's more efficient to work in the Lactate-Threshold-distance range.
Yes, I will definitely be doing some 5 and 10K's. I wouldn't have done this Half in December but it is for a local Women and Children's abuse shelter and I wanted to participate. I may do some Christmas 5k's in December too, in place of some of the shorter runs. I do hope to get faster, lol.