Depends on the server, mostly for ever, or just kicked.
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If you are on a multiplayer server, you may get kicked for a minor offense. This is to warn you never to do the act again. You can simply join again if you have been kicked.
it wont you need to download the server thing of the minecraft website and replace the old one with it.
It takes a couple minutes.
It truly depends on your offence towards the server.
No, you do not. You can host a Minecraft server as long as you have connection. Please note that you need to open your ports on your router to make a Minecraft server. If you do not have access to this, you can download a VPN-software like Hamachi or Cisco.