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It can be done with 16 weeks of training, 3 runs a week 10k, 15k, 20-25k. Each run you just need to train running the last 5k at a faster pace.

Can you elaborate on this or do you have a link to more info?

If you are on strava , you can see my training log.

are those the total distance per week, or per run?

Per run. Training for a 42km race, you have to train some endurance (put the length in).

Per run