It depends on the project - I guess once I get my bounty tokens from TravelerToken (TLT), I'll probably hold them until the platform goes live in Q3 2019, then I can start spending the tokens in the TLT ecosystem. This is because I believe that TravelerToken is an ICO that has a lot of potential to grow in the near future, as they are targeting the $2.3 trillion travel industry that involves more than 1.23 billion travelers on a yearly basis.

TravelerToken also has a very practical and viable use case - they are trying to revolutionize the travel industry by removing all the hefty processing and transaction fees that start piling up whenever there is a variety of intermediaries involved in the travel ecosystem. Furthermore, users of the TravelerToken debit card will be able to withdraw money in a foreign country without having to worry about poor exchange rates.

For your information, they are launching their bounty program soon (I heard it's tomorrow), so stay tuned. Here's the [ANN] thread for the TLT bounty program for reference. You can also visit their website or read their whitepaper to know more about the project.