There is no definitive answer to this question as it depends on a number of factors, including the complexity of the project, the size of the team working on it, and the availability of resources. However, in general, it takes around six to eight weeks to go live with a custom JavaScript development project. This timeframe can be shortened if the project is relatively simple and the team working on it is small. However, if the project is more complex or the team working on it is larger, the timeframe may be longer. In any case, it is important to ensure that all factors are taken into account before estimating the go-live date for a custom JavaScript development project.