Yes, it is heat resistant because the cabin's wall material is made from a sandwich panel that has a styrofoam board in the middle, similar to a cold room.
On average, 35 years. However, with proper maintenance, it can last longer.
The iron used is galvanized steel, which is iron coated with zinc. Its resistance is higher because zinc can prevent the iron from rusting.
Depending on weather and ground conditions, the installation period for each product type is as follows:
Eco Cabin
1 unit without toilet - 2 to 3 days
1 unit with toilet - 4 to 5 days
LGSF
2 - 3 weeks
Bungalow IBS
12-18 weeks