maybe 40 minutes? all the hard stuff was already together (fork, crank, etc,) 10 min to unpack 20 min to put together (wheels on,, seat on, handlebars on, pedals on) 10 minutes to adjust to "close enough" to ride. Competative cyclist offers a "ready to ride" option for about $100 more that due to dimensions must come on a 18 wheeler UPS truck. I can't imagine a more terrible way to waste $100.

Younger guys, Do the engineering thing it is worth it. CHE if possible.