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THIS!If she's really interested in you then it doesn't matter much, she's going to want to see you again ASAP. So let's say you're a moderately busy guy who typically have plans the next two days, planning a date 3 days in advance makes sense. Going up to a week isn't wrong either, it makes sense that sometimes you might have plans until then.
If she expresses that she really REALLY wants to see you again very soon, then same day or next day may also be an option if that's convenient for you.
Waiting for too long is almost never a good idea, doing it on purpose is stupid. She will lose interest and you will lose the opportunity.
So, whenever is more convenient for you is the right answer. If she's interested enough she'll say yes and she'll be there. If she's not that interested then you just saved yourself some time, congrats.