Usually I just do a quickie orientation...and I arrange to do it the hour or two immediately before my first night shift...then stay and work it.
Unless the facility and the agency is willing to commit something to ME (contract type work, fair pay for my orientation time, etc) I don't bother with places that want me to do more than this....and at 1/2 or less pay. Not worth it to me personally.
I understand there may not be many options in some areas, fortunately I can pick and choose some here.