In Uplink, I've heard that banks have the fastest passive trace times in the game; but if you have proxy bypass and monitor bypass, the active trace never starts. Do passive traces start from when the active trace would normally start, or do they start when you disconnect from the target host? (e.g. do I have to worry about being connected to such a system for a long time when not being traced?)
A passive trace starts when the victim discovers the damage has been done (e.g. data destroyed, large money transfers) if they have a trail. Nuking the target eliminates the trail (either via deleting system files and rebooting or running Revelation). If you can, use Log Deleter v.4 just to be sure. If you have a respectable tunnel chain, a passive trace can take days. If you're careful not to pick up any active traces, you can do a bunch of jobs in the space of several hours without worrying, then delete the logs on one of your first hops to prevent any possibility of a passive trace succeeding (The InterNIC server is best for this because they will never trace you).
Banks are a special case, though. You only have 2 minutes to eliminate the money trail by using Log Deleter to remove the statements. Having an account at the same bank as your target will save you a few precious seconds. After you've done that, don't forget to remove the usual log trails, though that is not as time critical as removing the money trail.