Final answer:
The question deals with construction guidelines regarding the timeframe for applying topcoat over primer. The period can differ but usually falls between 1 and 14 days after primer application.
Step-by-step explanation:
The question pertains to a guideline or a specification in an engineering or construction context, specifically related to the application of primer and topcoat on a surface. The exact number of days that can pass before a primer needs to be topcoated can vary depending on the manufacturer's recommendations, the specific materials used, and the environmental conditions. However, it is a common practice in the industry to apply the topcoat within a certain period, typically ranging from 1 to 14 days. If this timeframe is exceeded, the primer's effectiveness may decrease, necessitating surface preparation and reapplication of the primer to ensure proper adhesion and protection before topcoating.