1 month is a reasonable amount of time when you have the head start of YC demo day, or something equivalent, which conveniently corrals 100+ investors to sit do

1 month is a reasonable amount of time when you have the head start of YC demo day, or something equivalent, which conveniently corrals 100+ investors to sit down and listen to your pitch with an expectation that your odds of success are higher-than-average. If you don't have that, though, you need to spend time lining up enough interested investors in a short enough time window to build up that artificial sense of scarcity, and that can take a lot more than 1 month.