Wow, 100 days, that's over 3 months, what can they possibly be sharing/talking over 100 days? So we are saying this people are "trading" the outcome of 2-3 date

Wow, 100 days, that's over 3 months, what can they possibly be sharing/talking over 100 days? So we are saying this people are "trading" the outcome of 2-3 dates with 100 days of cat pictures sharing? I really don't get the point of this.