Since you have an Associate's in Liberal Arts, you may already have most or all of the "extra" pre-req's that the BSN requires, such as history, gov, fine arts elective, and so on. If this is the case, it would probably take the same amount of time for BSN or ADN. I think the BSN opens more doors, because you can return to grad school, for example. Also, in my area, the BSN programs have shorter waiting lists, so you might check out this situation with the schools you are considering.
I have friends who went through nursing school having never previously worked in the healthcare field before. It wasn't a problem for them. However, the ADN at the community college I attend is so hard to get into, they give students who currently work in hospitals/doctors offices extra consideration in admissions. I just got a job as a Unit Tech in a CCU. My reasoning for this is two-fold: 1-I want to gain practical experience and 2-I have to work and the hospital shifts provide the most flexible scheduling (I'll only be working 3 days a week-32 hrs, but am considered full-time). Plus working at the hospital, I get 100% tuition reimbursement for up to 3 classes per semester.
BSN and ADN each have their pros/cons. I personally chose BSN, so I'm probably preferential to it. But, for many, ADN is the best choice to fit lifestyle, goals, finances, etc. Hope this helps!