Saw your post @ Bullet.
Lots of good information on that thread by guys that have experience.
2 things to remember in forced induction.
1) motor under vacuum
2) motor under boost
You need to address both. And F no, there is no % of time in the simple 2 equation formula.
1) under vacuum, let the normal course take care of the cleaning. A simple solution is to run 1 line for a PCV system. Just make sure to address the added intake pressure. The addition of a secondary check valve works great.
Photo of an intake I had laying around for example.
EV 127, new screen.
Another showing the addition of a secondary check valve.
Next part to address is what you will do under boost.
You can run a can. But that's a passive system and will only keep your seals from leaking oil. We can do better than that!!
I choose to run a header evac system. I've done electric vacuumes in the past. All I can say is, if there ever was a design that actually worked well. All of us would use them! Unfortunately for a street car, they suck eggs.
With the header evac system, there are few parts to fail.
After several attempts to find a baffle that works, I've settled on the Jeg's brand. It's a nice unit. It has a 3 piece baffling system with a very large suction port. Almost 2" if I remember??
Here is the unit, and the -8 line.
From there I tie the 2 valve covers via a BBRC 'Y' block. -8,-8,-10.
Then a -10 line to a sealed catch can.
With several miles of using this system, there is ZERO signs of oil after the can.
On a monthly basis I have to drain the can.
This is an old picture, but if you look at it, it starts to all make sense.
The picture shows heater hose after the can. You really don't want to use heater hose and instead should use fuel line. Again, it's an old picture and was taken during testing.
Running 2 systems together addresses both Vacuum & Boost. Simply running 1 system will lead to issues.
A PCV system only will lead to blow by issues.
An evac system only, will not adequately clean your oil.
An open breather catch can only, addresses blow by. But doesn't help clean the oil, can cause oil vapor smell, as well as other issues.
A correct PCV & evac system is Active for both scenarios.
A vented catch can is a Passive system.