Sometimes if your lightbox is hot, some people add you to their network, but a picture in just one lightbox is not enough. More pub you have the best is. You gone have some mails from people who want you to add their pictures in it. I mostly do it, if it's relevent.

If I understand you want to know the best time of the day to launch it for public... I mostly do it at the end of Sunday, to have it in the new section for Monday morning...But the best time is probably a Tuesday morning like at 8 to 10AM. Because there's probably lot of new lightbox the Monday morning who's gone push your out of the new.

That's what I make for lightboxes