Type: Flat Pack Prefab Container House Application: Temporary offices in construction sites, office built in workshops, low-cost outdoor offices. Advantages: Short installation time, 1-15 days, depending on the project, a single container office only needs one day to complete the installation. Fast assemble: The installation time of a 20ft or 40ft container takes less than 1 day, and four workers can finish 5 unit/day.