¿How is the `user' time longer than the `real' time?
real: time spend between invocation and termination
user: time that the process was executed.
__Keep in mind that there are other process that your processor needs to take care of. So your program is not always executing.
__By instance, if you try to read, or to output to the screen (that are slow devices) you process will be blocked till the operation fulfills.
sys: ¿administration? (process creation, commutation, etc)