I had one of those jobs Saturday, had to put a new turbo in my truck so I could head to my land and do some bird hunting. It was overnighted for Saturday delivery, showed up as it should around 11 and I got to work. 8 hours later, I finally threw in the towel, it was just too late to get it working and still make the 4 hour drive and I was too frustrated to identify where my issue was. The next day I realized that the collector wasn't mated up to the turbo as it should be and I had an enormous exhaust leak where it's supposed to drive the turbine.
Today my upgraded turbo wheel arrived (I know I should have just waited on it but I really wanted to go bird hunting so I figured I'd just R&R the turbo twice) so I pulled the turbo out, replaced the wheel and had it back in the truck and working, all in under an hour. I don't know if I was irritated or pleased that it all went so smoothly today.