The safest time to call the number you typed into your phone with sweaty fingers is at least six months after you first make fleeting eye-contact with the man across the bar who gave it to you. Six months is an adequate amount of time to show him how not-clingy you are, how nonchalant, enough time for him to forget that he gave you his number at all. You’ll have a laugh about it, then he’ll tell you that he’s gotten back together with an ex and you’ll say it didn’t matter anyway because you weren’t that interested in the first place.