Ya! In this world of selfish instant gratification, on-demand entertainment, electronic games, and swipe left swipe right dating, 4 weeks seems like forever to most people. 2 weeks is long enough. ... The only way I see listing 4 weeks ahead working is maybe listing that you will be running one shots on a holiday, when some people are off work and bored. Even if you check back with everyone 1-2 weeks out, you still have to expect a bunch of people to ghost you without saying anything.