Final answer:
The collapse time of a light-weight truss construction depends on various factors and cannot be determined without specific information about the truss, such as the material, dimensions, and external forces.
Step-by-step explanation:
In order to determine how long it takes for a light-weight truss construction to collapse, we need more specific information about the truss. The collapse time depends on factors such as the material used, the dimensions of the truss, and the external forces acting on it. Additionally, factors such as wear and tear, maintenance, and loading conditions can also affect the collapse time.
Without more specific information, it is not possible to provide an accurate answer to the question. It is important to consult engineering professionals and follow appropriate safety guidelines when designing and constructing truss systems.