He's right as long as nothing goes wrong, the weather stays as forecast and he's able to resupply his expendables. We're right when something unexpected goes wrong and we can fix it without additional gear, or we have enough supplies to wait it out. Read his itinerary to get a feel for the planning to time his hike to avoid some issues.

I still don't have a good feel for how often he needed to be resupplied. How many days rations did he carry at any time.