Not exactly right as the window opens (as they have to ensure the area is clear before launching) but pretty close to when the window opens. Especially with exp

Not exactly right as the window opens (as they have to ensure the area is clear before launching) but pretty close to when the window opens. Especially with experimental rockets like this because as we've seen before, it isn't guaranteed that the rocket passes all checks and lifts off at the first attempt. So that gives them the largest amount of time to reset and try again before having to give up for the day and schedule the next try.