I don't really have a GHB per se. However, I do have stuff in my car. I could alway rearrange the supplies to make a GHB. I work typically about 35 miles from home, so I anticipate a 2 day walk if needed. Of course, I'm not sure why I wouldn't be able to drive home (I'm not a believer in EMP theories). My biggest barriers are a BUNCh of rivers and marshes locally. If I had to hoof it off-road, it'd probably be closer to 4-5 days, if not more, simply b/c I live in basically a monster wetland.