In 3.5, the rule says, "It takes a full-round action to search a 5-foot-by-5-foot area or a volume of goods 5 feet on a side." But I can't find any rule about it in pathfinder? Any ideas?
It is a move action to check a 10 by 10 area. The rule is first mentiond in unchained, which makes is seem that was the original intent, and it comes up again in the Ultimate Intrigue book as a point of clarification.