This will vary depending on the style and size of the building you have purchased but the following could be used as a general guide for your building;
Smaller Wooden Sheds and Summerhouses (1-2 persons) approx 1-2 hours
Larger Wooden Sheds and Summerhouses (2 persons) approx 2-3 hours
Smaller Log Cabins (2 persons) approx 2-4 hours
Larger Log Cabins (2 persons) approx 3-5 hours
Mon-Fri 9am-5pm