I did it back in the dark ages, when you had to physically attend classes. It was a long drive. A lot of the time, it was one class a semester, plus one in the summer. Some semesters I took 2 of the easier courses together. Many of the courses are not that difficult.
Honestly, I got depressed in the middle of it, after an awful experience with a crazy preceptor, and I did nothing for a year. So it took me 5 and a half years.
Finding a decent preceptor will be the biggest challenge, if you attend the the typical program, which doesn't provide preceptors.
But yes, schedule wise, it is very doable. Depending on what else you have going on in your life. This is probably not the time to father triplets!
In fact, I highly recommend working full time in psych, while attending school part-time. You will need the experience, because school is not going to show you how to be a Psych NP.
Get that thought right out of your head!You are going to have to make a bunch of extra effort, to make the information your own.
The people I know who went to NP school full time, without a partner to support them, and borrowed 2 years of living expenses, plus tuition, are still not even close to being out of debt 15 years later.
And some of them are cursing becoming an NP.
So the answer, depending on a lot of factors- your energy level, the school schedule, and no big bumps in your road- is about four years.