Mine goes something like this. These are minimums. Specific situations, environments and varying ability to improvise (based on situation, environment, mindset, etc) could greatly extend these times.

I think the above is the key. What are the situations, environments and most importantly your ability to improvise. I agree with Dynamo that most things in your EDC are what you might need to get home. As with him, my truck is never too far away unless I happen to be out with friends and they drove. If I have my PSK, who really knows how long I could survive. It has snare wire and fishing line and hooks. A small amout of water purification supplies etc. Can you build a shelter in the woods? Can you find edible plants? Can you catch fish? Ralistically though my PSK is just to try and find my way out of the woods should I get lost or some other calamity. Now, onto my BOB. Yes it has more food, more shelter, more cooking utensils, etc. It makes life more comfortable for a longer amount of time. Does it keep me alive for a month? That all depends on the things I said before. Can I catch fish, snare a rabbit, find edible plants. Now, a little off topic....should TEOTWAWKI happen, let's just say I have supplies laid in. A good Boy Scout is always prepared!

JMTCW YMMV
Charles