Do you mean a prebuilt system? or just ordering all the parts at once?
I've never had a prebuild, but I have ordered whole builds worth of parts, they dispatch pretty quickly, usually in time for next day delivery. usually end up with one large box with motherboard, cpu, ram, hdd, graphics cards etc in their own packaging and bubble wrap to fill in the empty space, then cases and monitors just in their own box with shipping labels on the outside.
if you're very lucky you get a bag of haribo in the box as well