Leaving Dec 8Th for basic and Indoc...

I am leaving Dec 8th for basic and indoc and I was wondering where my times should be as far as running, finning, swimming etc...
My 1 1/2 time is 9:58
500m swim is 8:38
1500m fin is 31:20
I am a pretty big guy, so it seems looking at the other PJ's, Im 6'2 and 200lbs; so running is pretty rough on me.I am great at long distance running because i've done a few half marathons (13.1 miles) averaging about a 8 mins miles, but i feel like whatever I do I will never be ready.
Does anyone have any suggestions on what I should do as far as training these last few weeks?? Thanks for you time it is greatly appreciated!!