The more credits you need, the longer it will take you, depending on YOUR conviction to get it done. Then you have to consider whether or not you pass EVERYTHING on the first attempt. At EC, failing an exam is an automatic 2-month retake waiting period, although you are allowed to take other exams. I was taking general eds at a community college at the same time that I was doing EC's program. From start to RN in hand was 10 months total. But as I have posted on this site elsewhere, EVERYTHING was lined up at the PERFECT point in my life, even things beyond my control. We don't know what your background or study habits are. Even if we did, only YOU will determine your speed, success, or failure in this program. If you want to be done with the program in a year, then do it. Figure out when you want to be eligible for the 2-month FCCA and work towards that goal. Figure out how many exams you need to take per week or month to reach that deadline and then start studying. Those are the things you can control. Getting a CPNE date is not in your control after you submit all the required documents for the CPNE. EC is always updating requirements.
So if you like the ASN program as it is now, it would be wise to get started before they change anything else. When I was there, the FCCA was an open-book, at-home, paper exam, which I completed in about 2 hours AND there was no math requirement. Others before me didn't even have the FCCA and they had one exam less to take. Nothing EVER remains the same. If you haven't applied, that's the first step in determining how many credits you need to actually take. Then you can get a clearer picture of how long it will take based on the assumption that every exam is passed on your first attempt.
On a side note, I've read some of your other posts from questions regarding LPN-RN , clear on up to graduate level and/or higher. It seems to me that you are very unsure about EC. In my opinion, if you want to find out if EC would suit your needs now and later, I think you should have in mind what your ultimate goal is and where you plan to practice; then contact THAT state's BON to find out if they accept EC's ASN degree. If they do, you might want to get busy with your studies before that state changes their acceptance of EC. What's acceptable now won't necessarily be the case later. Good luck!