If an ICO project take too long time to get their token listed on any exchange, I think all investors will be disappointed and they will not trust these ICO projects anymore. For example, BuzzShow is a great ICO project but it's months till the ICO ended but their token is not listed on any exchange yet and BuzzShow team don't have any news related to exchange listing yet ). At the moment all investors are selling BuzzShow token on ETD and ForkDelta with really low price because they don't believe in this shit anymore