I regularly walk 5km (3.1m) in 45 min which is a fast march. So it would take me 5.5hrs if I did the math right.

Anyway...

Unless this is repetitive your friend should be prepared to come out and pick you up.

You also need to address this problem: why are you stranded?

I don not know what you have written about previously but why do you live so far away from civilisation and not have any means of transportation. You can pick up a junker of a car cheap that would get you from point A to point B. If driving isn't an option then I suggest you ought to rethink your living arrangements and move. Relying on friends and family occasionally is one thing but expecting this constantly is rather unfair to them. Is this the case I wonder? Has your friend grown tired of picking you up?