//-- this means you have an incomplete strategy ----//
It depends on your strategy
if you want to close all open orders on friday you may not open orders on friday too, i think
As others have pointed out, it depends upon whether you are a long term trader or short term trader, and it depends upon your strategy.
It's true that trading continues over the weekend even if our brokers/dealers do not offer access to the action during weekends.
So, on Monday morning, you might find that the market went against you quite a bit. Similarly, it may have gone in your favor quite a bit. But what does "quite a bit" mean in this context?
If you are a long term trader, having the market go 30, 50, or even 100 pips against you may be acceptable. If you are looking for smaller "bites," even 30 pips may be disastrous.
The way to get a sense of this is to place a bunch of demo trades and look for yourself. If your strategy can be encapsulated as an EA, then you can see what happens using the Tester.