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Long endurance improvement is a fairly long process, hence the reason why training for marathons and IM is measured in months. If you start from a point where you already have a good endurance base, the sharpening process thru speed and tempo workouts can be dramatic in 6 weeks and noticeable in three. If you want to know how long it will take from feeling comfortable running a tempo or race 10K to being comfortable running a similar tempo or race half marathon, I would measure that in a couple months minimum unless you have been doing frequent long runs. Building your Max VO2 (new blood transport capillaries) versus building new muscle is probably the better question and Max VO2 changes take weeks to months, while muscle repair and strengthening can be days to weeks. Use the Triathletes Bible (Friel) and build a training program for a specific goal would be my recommendation.