Before the island.
Josh arrived with a police background, hunting experience and several wilderness courses behind him. He had practised self-reliance from a young age and left his family at home for the experiment.
What happened in Season 1.
His stay ended after approximately 12 hours. Bear activity around the drop site made remaining unacceptable to him. That short duration describes his decision in this setting, not the full range of his abilities.
Why the journey ended
Bear activity and concern for personal safety
Season listings give 31; a pre-broadcast local article gives 32. Ages are retained as listed for the season, not as current ages.