Sense magick can take as long as it wants, it wouldn't be wise to try and learn what is called "Combat Magick". That is why people are asked if you are in trouble or something that isn't law wise trouble, then call the police.
Well combat magick isn't really possible for close incounters (it might even be possible) I am not sure..but what I have been taught is that magick isn't always reliable to what on..if you are situations that are dangerous, you have to figure something out.
as decadence said its true you cant make fire ball etc... but we dont disapoint you about magic you can send negative energy to your target
its hard you should concentrate and have powerful chakra and this act need very amount of energy
just inchante something for what aver because even if there was such combat magic than by when your done casting if you'd fight me or someone lick me than you woud wish that instead of spell casting you woud have called a ambulance, no offense intandet