Some kinds of fruits carvings required some hours to finish each piece, so this hobby is good for the people who have a lot of free time. It is also indirectly make the people who regularly practice this hobby to be more patient and cool. For this hobby, you must have a set of small knives for fruits carving which you can see from the first free streaming videos from the following link.
If you plan to buy the carving books or DVD online, it's best to check with the sellers whether there are the set of the necessary carving knives included in the book or not.