I would go to the University you are considering for nursing school and ask these questions. Bring your transcripts so they can assess what you need to complete a BSN there.
One thing I have learned here at allnurses is that all will say they spent/spend HOURS AND HOURS reading (we got 300pg reading assignments over night and did endless careplanning, like anyone) ...but it seems to me the amt. of time varies. It varies by school and by individual. Some can scan and glean what they need from their reading assignments very quickly...others take more time, for example. You can plan to spend LOT of time writing careplans, preparing for clinical rotations at the hospitals/dr offices in your area....etc. How much exactly, I don't know. It's very individualized, I think.
For me, it was overwhelming at times. You will find folks here at allnurses who will tell you they attended and graduated nursing school while holding down fulltime jobs and raising families and did ok....others like me, it was all I could do to finish school and raise my family, forget working a job...it will vary...
If I were you, I would talk to some of the students at the university you are considering attending....ask THEIR experiences. I bet what they say will definately give you a realistic insight as to what YOU can expect, given your abilities and time management skills. Good luck to you!