Considering Time Gate is set to be a life project at this point, I will let my characters go when they let me go.
In all seriousness though, Time Gate is very long so the day that the story is complete will be a saddening one. Though I am looking forward to getting all the work done, it's more for the sake of seeing how my readers interact and experience with the story, more so than finishing the story itself. Aside from that, there are some characters I will have to say goodbye to before the story is even over . . . but we'll cross that bridge when we come to it.
Either way, Time Gate has been a part of my life for years now, and it will continue to be a part of my life for years to come. The cast of Time Gate is pretty much my fictional family at this point, and even after it's completed, I'm never truly going to forget them or let them disappear just like that.