Putting together RTA kitchen cabinets is a straightforward process that can save you time and money. On average, it takes about 30-45 minutes to install your first cabinet, and each subsequent cabinet becomes easier. Typical wall cabinets can be assembled in 8-10 minutes, while base cabinets take 10-15 minutes. The total time to assemble RTA cabinets for an entire kitchen depends on the number of cabinets and your skill level.