In a non-hospital setting, run by an international plasma company, I had 2-3 days of computer training and then minimum 6 weeks of shadowing another nurse. That ended up getting extended to 8 weeks due to misplaced paperwork, and during that time I also cross-trained to non-nursing duties that were primarily done by MAs and phlebotomists (the nurse who was hired before me did even more cross-training in the same period, and the nurse hired after me did far less, so it was really self-directed/depended on how busy the center was).
While it was frustrating at times to have to undergo training for stuff I had literally just gotten a degree in, and to have to keep up with quarterly training requirements, it was also very nice to have clear expectations and well-documented training. It reinforced a lot of what I already knew and gave me a clear pathway for going forward on my own (nurses frequently worked alone and with a doctor only available via phone at this center).
As a school nurse, the coordinator of nurses for my district was thrown into school nursing without any training beforehand (~15 years ago). She hated the "trial by fire" so much that now she's organized 3 days of orientation for new nurses as well as 3 days of annual training for all nurses at the start of the school year. In addition, we get mentor nurses at local schools
, and don't have to take any student nurses for our first year, as she knows we are still learning the ropes. She is a blessing!