Although Novorapid will work in about 15 mins I believe, learning what doses to take can be a process of trial and error it may take a few weeks for him to learn how to take insulin/match it to his food intake but once he is receiving some medical treatment his levels should come down lower than what they are now, which as you are aware is pretty hihg, and then it is just a process of fine tuning and learning the ins and outs of his medication routine.
A book I can recommend is 'think like a pancreas'. I'm presuming your husband will be on a basal /bolus routine (base dosage of insulin to last all day with meal dosages to match to his food intake) so forgive me if this is not the case.