Days to arrive, hours to assemble.You should go to youtube and watch a couple videos before getting started .I wish there was a printed instruction manual that detailed how this works.You must go online to find the operating manual.When assembling, Skip the zrod screw install until last. insert it from the top and just place the tip into the stepper motor coupling. Its much easier to install that way and it will not bind.Some things overlooked. Set the bed temperature in the menu, set the extruder temperature to match the material you are using.