In most urban settings, a typical outdoor furniture set takes about 45 minutes to 3 hours to assemble. A simple bistro set with two chairs and a small table can sometimes be ready in 30 to 60 minutes, especially if the pieces are partially preassembled and the instructions are clear. A four-piece conversation set usually takes closer to 1 to 2 hours, while a larger dining set with six chairs, a table, and cushions often lands in the 1.5 to 3 hour range. Modular sofas and bigger balcony or terrace collections can take 3 to 5 hours, or even longer if there are many sections, glass tops, or anchoring requirements.
The biggest factors are the number of pieces, how much is flat-packed, and whether the hardware is clearly labeled. Having two people helps a lot, particularly for tables and sofas, because one person can hold parts steady while the other tightens bolts. A cordless drill with the right bits can save time, but you still want to hand-tighten at first and then finish firmly once everything is aligned. Good lighting, a clear work area, and a small tray for screws and washers also make the job smoother.
If you are short on time or the set is large, professional assembly is worth considering. A crew that knows the product can often complete a standard urban patio set in about 1 to 2 hours. My advice is to check the piece count before buying, open the boxes in a clear space, sort the hardware, and allow at least half a day for anything bigger than a small balcony set. Most people can handle a basic set in an afternoon, but larger modular collections are much easier with a helper or a pro.