If 1 day, means she is busy.
If 2 days, that means she is not into you.
for mine, the longest i waited was 24 hours. And her replies mostly at noon or evening. And she will reply to my text and when i reply back, i need to wait for 6/12/24 hours for next.
But i got used to it already. haha.
actually when i looked at the conversation with other women, my replies are also not fast and some even no replies from me. So yea, most likely due to level of interest and then busyness.
As long as she replies, means got chance, faster ask her out! if no interest, means no reply at all, like how i nv reply to many other conversations.