All women are different. I think enough of a conversation to make sure that each of you is legit.(as opposed to some dude from nigeria) And then a small meet up for coffee, a walk around the park, or a quick cocktail to determine if you want to go on a date is enough...
I have heard from some women they dont like feeling like they need to interview for a date. For me, i dont want to invest time in someone i am not interested in.