How long do girls wait to respond to asking you on a date?

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ok - I'm sorry, but i only had facebook, k? my phone is broken right now.
Basically, I said,

msg-1 "I'd like to get to know you better, and go on a date with you. Lately, I felt there was a connection between us, and I figure i'd ask a pretty gal on a date. =)."
msg-2 "Forgot to add s'all good whatever your feelings are. My massive ego will survive (and could probably use some deflating)"

In its grand respect to privacy, Facebook says she read msg-1....is she going to think about it? She's in her late 20s, and we went to college together but never dated, not bff, or fwb. sooo...i can understand her pov.....but...THOUGHTS??/
eh - i was trying to sound confident and save face in case she does say no.
i mean, i'm going out on a limb here too!!
@ Brett: isn't that the ENTIRE POINT of a date!??!?! gawd....forget yahoo. i'm just going to do my own thing.