Hi,
The TIME column indicated how much CPU time the process has been running. This is different from the actual amount of time that a process runs. Remember that Linux is a multitasking operating system. There are many processes running all the time, and these processes each get a small portion of the processor's time. So, the TIME column should show much less time for each process than it actually takes to run. If you see more than several minutes in the TIME column, it could mean that something is wrong.
This wisdom comes from:
Slackware Linux Essentials -chapter 11 Process Control
Hope this helps.