Anyone know how long usually it takes for ICO projects to list their tokens on an exchange? Is it different with other exchanges?
It depends on ICO, when they want to be listed on some exchanges. Many ICOs are listed unofficialy on DEX exchanges immediately after token sale, but here, do not expect good price to sell.
I think the list of the token on the exchange floor depends on the developer team. And the primary factor is the finance of the project because the Token wants to be listed on the exchange floors, it cost a lot of money to do it.