I was an LPN for several years before becoming an RN.
In our state, LPN classes are 12 months, full time. We have schools that have part-time evening classes. Those are either 18 months or 2yrs, depending on the school.
Our state vocational schools are now part of our community college program, so the core classes (math, anatomy etc) are college credit hours and do transfer over to other programs/schools/degrees.
In my case, the first 3 months of school were grueling. After that was a piece of cake (maybe those first 3 months were so bad that it just made the last 9 seem easy

). Seriously, it wasn't that bad and the year just seemd to fly by.
Around here, the pre-dominant employers of LPNs are nursing homes, although some hospitals still hire LPNs. YMMV. I know I got my hospital job as an LPN. Also, in KY, the LPN scope of practice seems to be growing all of the time ( LPNs can now give many IV drugs, which, when I was a LPN, was not allowed).
It's true that LPNs don't make as much as RNs, but, it's certainly more than half of the RN salary. I'm guessing the starting LPN pay is about $15-$16 hour, but may be more in nursing homes.
I started out working part-time hours when I first got out of LPN school. I worked 3 days/week. Later, I went to a modified WOW program, where I worked every week-end plus one other day and got paid for 40 hrs.
If you do go to LPN school (and I did it because at the time, I didn't have time to devote to 2 yrs doing the pre-reqs followed by 2 more years of nursing classes just for an associate degree), you can become an RN with 1 year full-time in a bridge program (or 2 years part-time with evening classes) as soon or as late as you want after graduating from LPN school.
I got my RN doing the part-time evening program, but, all of my classes were on-line. I had to go to labs for A&P and micro for 3 hrs on Saturday mornings (1 quarter each) and I had to go for clinicals 2 evenings a week for 3 quarters (4 hrs each evening, although that has changed now to 1-8 hr evening).
If you think nursing is something you might be interested in, I say go for the LPN, if that's all you have time for now. If you like it, you can go for more later. One nurse I worked with got her LPN and went straight into a bridge program for her RN, because it was faster to get her ADN that way than by going through the 2 year ADN program (because of the pre reqs that are required for the community colleges). It was also easier to get in school that way. I, on the other hand, was a LPN for 17 yrs before I decided to get my RN.
If we want, we can take the accelerated BSN program and get our BSN in 18 months, going to school part-time.
The way I see it, it's a win-win proposition.