"Blocks till next confirmation" shows how many blocks more need to be produced by the network for your next move from "Unconfirmed" to your "Balance". In other words, it is a countdown of how many more confirmations your "Unconfirmed" balance needs to be confirmed and moved over to your balance pending payment. Bear in mind this won't move all of your unconfirmed total over, just the next first batch. Hope I didn´t confuse you more with this explanation.