Most Helpful Girl
Hearing from a guy I liked the day after a date'd be WONDERFUL. Otherwise I'd just be constantly checking my phone going "did he have a good time? Should I call him? Am I being desperate or misreading things? What did I do wrong?" And hearing that he had a good time? That'd just leave me smiling and happy. Heck, if the date finished up early in the day, hearing from him the SAME day that he'd had a good time would be nice. The first date I went on was a Friday -and we both had prior obligations that meant we wouldn't be able to do much (if any) communicating that weekend -he told me up front about that and said that he'd had a nice time, we both agreed that a second date was in the cards, but also that it was my turn to pick what we'd be doing.
When I really like someone, I'm happy to be around them and interact with them as much as I can. Hearing that me or conversation with me is enough to make someone -especially someone I care about -happy? That's FANTASTIC. Too much would be if it was constant (every few hours, some sort of message) and the guy didn't actually seem to care about what I was saying -or didn't let not-in-person conversations that were wrapping up naturally end.