SecondWar on 21 March 2010
1) Yes
2) Yes
3) Cant give you an exact time but have a look on a Pokemon fansite with a HGSS guide as itll show you all the stuff you can do ingame which will give you a feel for the length
4) Both games are really the same except for some version exclusive Pokemon and which legend you get first. Most people will get Heart Gold simply because its name comes first
