Survival also takes a long time to max out, but you can also put a rubberband around your Analog-stick and controller to automatically walk around in circles like with the photography skill. You do not need to sprint -- just moving around is enough to get what you need. Leave the game on for hours. Check back once an hour to rest the party or make sure you are still moving around and have not gotten caught on something. Let the team run around for a full day or more to max out the skill, depending on your progress in the story. You will do lots of running as you play -- so this will be unlocked naturally during the story. The game takes approximately 50 hours to complete, and the survival skill requires approximately 25 to 30 hours of running to max out. You can also use the "Infinite sprint" trick to speed things up.