Probably it was already there 11 hours ago. I have gone through a few rounds. All of them 24 hours. Looks like King is rolling out 30 gold bars for all players. I have a friend whose box jump from 10 to 30 golds today and time frame drop from 3 days to 24 hours.
That’s probably the case as I opened the game around 8AM (EST) this morning. Anyway, it’s a better deal than 10 gold bars. Also, there seem to be more boosters going with that.