Most projects are not usually quick to launch on exchanges these days, I think they are afraid of dump or are just being smart to have some other exchanges acceptance so as to get listed at several of them. However it seems the requirements in getting listed in good exchanges is becoming more demanding. But generally I feel the market conditions is responsible
Yes, it is true. Market conditions that make altcoin prices fall especially Bitcoin and Ethereum make ICO run poorly. Some fail and scam or some extend the ICO time. If the ICO is successfully done you can see on RoadMap to find out the estimated time to release coins in the exchange.
It usually takes between 2/3/6 months and even a year according to the team's strategy. Or you can ask more clearly in the telegram group to get an answer.