Don't get attached to your botting character, you'll never know when you'll lose it. You can run it for as long as you want and you'll probably not get banned. Try not to attract to much attention (ie selling 30 scrolls on the forums or 9001 magic powders/empowered enhancement stones on the market place). When you log on switch to a random channel that is lightly populated to avoid other people. Try to transfer the profits off of the bot to a non hacking account every once in a while.
Other things to keep in mind.
If Nexon does ip ban you can connect to the game with a proxy and disconnect from the proxy after you have entered the game, this will keep your bot account ip separate from your main.
Blocking screen shots to Nexon servers might help. Search block nexon vindictus screenshot on google
Clearing out all you mail maybe helpful too.
If you are using hackshield simulator you'll have to replace it after a game update as it will usually write over the simulator.
Check the forums continually to find the latest status on hacks.