What transfers, and the cap that actually bites
GCU's headline transfer allowance is generous. The limit that decides your bill is a different one, and it is the one nobody leads with.
For a nurse arriving with an associate degree, transfer credit is worth more than any discount you will be offered. It is also the part of the decision most often settled after enrolling, when it is far too late to act on the answer.
The 90 is not the constraint. The 84 is.
An associate degree in nursing is overwhelmingly lower-division coursework. That is not a criticism of it; it is simply what an ADN is. So the ceiling a nurse actually meets is rarely the 90-credit total - it is the sub-cap saying no more than 84 of those may be lower-division.
The practical effect: two nurses can both be told "GCU takes up to ninety credits" and end up with materially different totals, because one transcript carries upper-division work and the other does not.
The rules above are published and general. What matters is what your transcript is worth against them. That is a specific answer about specific credits, and it changes your timeline and your total more than anything else on this site.
The residency floor
Whatever you bring, the final 30 credits are earned at GCU. That is standard practice across accredited universities rather than anything unusual, but it sets a floor under how short the programme can be. If someone has implied you could finish faster than that, the arithmetic does not support it.
Alternative credit is capped too
ACE and NCCRS recommended coursework and national examinations can carry up to 30 credits. That route is genuinely useful for filling general education requirements cheaply, and it is bounded, so it cannot be stacked indefinitely to shortcut the degree.
Put your own situation to someone with nothing riding on it
Twenty minutes, free, and no one on this side earns anything whichever school you land on. We will tell you to stay where you are when that is the right answer.