It depends on the game, if it takes up more or less memory. Also it could be your connection, mines is pretty slow anyway so I can't say if you have a faster connection the download will be faster
It matters on how much memory the item you are downloading, a picture package 10 seconds, a demo 1-2 hours.
This happens because the Xbox Live service requires a lot of bandwith to function properly, so it will "suck" a lot of internet from your router.
click on Xbox live or Play Station Network and go down to combat training
OK, well you were half right in your question. In order to play on XBox live you will need either the wireless network adapter or run an Ethernet cable from your 360 to your home router. Simply having the hard drive will not allow you to play on XBox live.
no you can only play others on the same network
NBC
There is no way. PS3 users play on "PlayStation Network". XBox users play on "XBox Live".
No Live is a Xbox network the Playstation products use PSN or Playstation Network
no it is a different network
System link is a way to play with other people on the same network as yourself, so no you do not need live to system link but you do need to be on the same network
yes
Play it on newgrounds.com or download it from the Xbox Live/Playstation Network Marketplaces.
PlayStation Network, Xbox Live Arcade,
No, you just need PLAY STATION NETWORK or XBOX LIVE