Approximately 350 PC's to unpack and setup and install with dual boot Windows/Linux, 15-20 virtual machines on each - and about 300 software packages (which don't always like to play well together). 30 servers (storage, backup, directory services, license managers, web and DNS servers, etc.) and 15 Tbytes of data to migrate to new hardware (some of it running on new platforms). Oh and they're changing the entire IP address space so everything has to be re-assigned.  And still waiting for the air conditioner contractors to finish the ducting and plastering and vacate the rooms where this stuff needs to be done. The guys installing the internet cables have also fallen a bit behind. Oh yeah, drop dead date for having it all done is in uhm - two weeks.

...Gives new meaning to the term "drop dead date".