unless this is not normal routine for these machines, I'd say 3 months tops from being new to needing a major amount of work done to them.
Hydraulic hoses can be semi protected by wrapping them with heat shielding fabrics additionally covering the most exposed areas of them with a cladding might help them to last a full 3 months the bearing in the rollers of the track groups will have lost any lubricant by the end of the first week if not sooner. but the bearings pins and rollers would continue to do their job until they completely self-destruct, they have been known to last for several months being ran dry in harsh dusty conditions buit the constant heat on them will soften them, take all of the temper out of them is a short amount of time they would wear out in only a few weeks not several months under those conditions. the track pads will coat over but the pins in track rails will suffer like the bearings and rollers but would possibly last 4 to 6 months anyway. the drive sprockets will go about the same as the pins in the rails the big problem is going to be the seals in the track adjuster and the final drives. The radiator and the after cooler are going to be a huge problem especially on newer equipment since a lot of aluminum and sometimes even plastic are used but those cold be critical use specked at time of purchase. There is quite a bit of harsh environment specialty components available for cold hot dusty wet and chemical use I just don't know about how well things would fair in a molten metal environment. I'm sure a lot has changed in the 30 years since I worked as a contractor at a Caterpillar rebuild shop.