The time it takes to build a Ram 2500 varies depending on the complexity of the configuration and specifications. Generally, it can take between two to four weeks for production and delivery. This includes ordering parts from suppliers, manufacturing, quality control tests and other processes before being shipped out from the factory. The actual assembly process itself typically only takes one or two days but this depends on how many options are chosen for that particular model. It is important to note that even if you order a standard off-the-shelf truck, there may be delays due to factors like weather or other unforeseen circumstances. Additionally, certain customizations could add additional time onto your wait as well. Ultimately though with proper planning and communication with dealerships you should have no problem getting your hands on your new Ram 2500 in no time!