My husband is scheduled to have a c3-t1 acfd due t spinal stenosis and bulging disk. Can this many levels be complicated and dangerous?

Yes it can. All types of surgery can involve risk and potential complications. Choosing a skilled expert is important. When the best procedure is properly selected, planned and performed by him/her then a very successful outcome can be achieved.
Yes. That is a huge surgery. If you have not already, consider a second opinion if possible. Good luck.
Yes of course. Having many levels mean more time under anesthesia and possible complications but if he need it nothing you could about it.