dont even think about the 2.4 km, a word of advice, just run about 5-6km 3 times a week, dont worry about your times, once you can run that easily (without to much pain)then start to worry about time, even then in basic it was never really you run as fast as your slowest person, it was not like that at all in my platoon, we had several marathon runners that could do 9 or 10 km no problem at under 5 minute km, and people like me, that could run forever at their own pace, since joining i have been workin on time by using interval training, run one km hard and walk the one km then decrease the walk time, works great, while in POET i learned that trick and i am running under 5 min km for 5 km or less, longer runs i hover around 5-6 minutes, which is ok, my build i am no way a mrathon runner, i run for rugby reasons