It can maybe take a day before GBTS can be traded on Etherdelta, as I indicated in my previous post, it’s an easy setup. Maybe 2 weeks before the token is on the Bancor exchange, because you need to contact the Bancor folks at contact@bancor.network (Here are reasons why you want to be on that exchange example1 and example2). From an UX using Etherdelta is challenging, but Bancor is super simple.
This is one of the reason why they should not burn their leftover tokens, they’ll need them if they want this project to survive in the future. Just in case you think the market decides the prices of things, search: Martin Shkreli 
IMHO unsold tokens are like money in the bank that you decide the price of, as long as you keep the project going. It would be foolish to think that the market of today is the market of tomorrow, just because cryptonerds didn’t buy your tokens today, doesn’t mean that future investors won’t be interested, as long as the project makes progress everything is possible.
@Gamerbits thanks for the lessons 