The box build process is different for each project and hence the time also varies depending on the degree of complexity of the product. Some may be a simple PCBA within an enclosure, while others may include complex connections to a UI display. So, you better discuss your requirements first for us to come up with a feasibility study, and then we would let you know the timelines. If you provide proper information like product dimensions, Bill of Materials, sample prototypes, etc. then we can shorten the box build assembly process. You can bank on us for a high-quality assembly process.