As "Saint Zaanstad Cathedral" does not exist, there is no time estimate for a visit.
Since the attraction "Saint Zaanstad Cathedral" is not a recognized or existing landmark in Zaanstad, it is impossible to provide an estimate for visit duration. If one were to visit other, actual attractions in Zaanstad, such as the Zaanse Schans, a typical visit could range from 2 to 4 hours, depending on the number of windmills and museums explored.
For a general exploration of the Zaanse Schans, allow at least 2 hours to walk through the village and see a few key sites. If you plan to enter multiple windmills, visit the museums (such as the Zaans Museum or the Albert Heijn Museum Shop), and experience demonstrations, a half-day or even a full day might be appropriate. Transportation time to and from Zaanstad should also be factored into any itinerary.