How long before she calls?

For the past week, an anonymous girl has been coming very early in the morning and leaving a perfume scented rose on my doorstep. The first couple times around, I thought it was a prank, but all of my friends solemnly swear they know nothing about it. After the 3rd time I found one, I wrote her a brief note stating that I was definitely curious and gave my cell phone number telling her to call me, then left the note taped to my door. The following morning, I found the note missing, but this time no rose or anything. It's been 2 days, but no one has called me, nor left any more roses. I left another note last night saying I was still curious, and it was still there this morning. Do girls wait awhile before calling a guy once they get their number, and if they do, how long? I'm inexperienced in this area because I'm used to getting the number from the girl, and not the other way around. Help me out here, the suspense is killing me!