I think it is contingent. If she's a mature person, then 2-3 days would be nice. My bet would be three days as a perfect grace period. She gets a good impression of you as someone who gives space. However, if she's not very mature in her thinking, calling the next day would make her day and make her very excited! If you delay it she won't be very happy.
"usually I tell the girl when I will be calling her, so I dont have to play that game, IE, I'll call you on monday, or I'll call you tomorrow...."
That sounds intelligent, except you have to carry through. If you failed to meet up the set date [to call], you would be likely scored low.