Is there a such thing as an accelerated Nurse Practitioner program?

What would be the longest schooling you'd have to take if you had a BSN degree to become a nurse practitioner?

Most universities require no more than 6 six years towards completion of a master's degree in nursing. If the six years are up and the student is not done, then they're out. That also applies to any student who takes a leave of absence during the program and does not finish in 6 years. As far as NP programs go, the shortest I've seen is 18 months but that requires that the student enroll with full time credits (8 credits and above) for the entire program.

And the same questions for Nurse Anesthetist...

can't help you on this one...not my field of study.

And can you continue to work full time while going to school part time for these, or do you hvae to quit your job for a couple years or whatever?

Most NP programs can allow students to keep working their RN jobs while in school. I started my NP program while working full time as an RN. The second year, I dropped to part-time but some of my classmates stayed working full time.

Nurse Anesthesia programs- only full time (60-80hrs/week between class, clinical, studying and other preparations for clinical) no significant amount of time for working- In Michigan the program lengths range from 24 months to 28 months- straight through you are in the clinical areas during University semester breaks.