In hand mainly focuses on abstract things or uncountable things, it can be a situation in hand, an hour in hand, some money in hand, a topic in hand etc... (compare with "in question": the man in question is guilty of ~ the topic in hand is a delicate one). Examples: 1) Pupils have over half an hour in hand = left/available/to spare. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.