I know everybody's driving habits are different, I mostly drive short (10-20 minutes) drives almost everyday, but here is a pic of what my JLT Catch Can has collected over the last 1500 miles:

It's about 1.5 ounces...for 2018, I'm averaging about 1 ounce/per 1,000 miles driven.
Here is what the bottom of the Catch Can looks like after I've emptied it:

I believe most people won't notice much of a difference in their vehicle's performance...the effect of this oil being drawn into the intake and possibly coating the valves is a very slow process and may be very difficult to detect.

It's about 1.5 ounces...for 2018, I'm averaging about 1 ounce/per 1,000 miles driven.
Here is what the bottom of the Catch Can looks like after I've emptied it:

I believe most people won't notice much of a difference in their vehicle's performance...the effect of this oil being drawn into the intake and possibly coating the valves is a very slow process and may be very difficult to detect.