Wait a second what do you mean by individual lighting lanes? Do you mean the virtual lanes? The actual lighting lane(LL) at at Cosmic is never very long, even at Christmas the LL(paid) at Cosmic was hardly 25 minutes for us.
Now the virtual standby lanes and I think that is what you are talking about(the Non paid line at Cosmic) is another story. In my experience time of day matters for Cosmic more than anything else, so far for us peronally even more than time of year or day of week.
For example we were at EPCOT last week and the virtual lane at Cosmic went out of the que all the way to the restaurant. I asked the CM time line on the virtual standby and he said, "so sorry the virtual que is a minimum 90 minutes, maybe more". To me that was fairly rare. For us the virtual standby is normally never more than an hour, but I don't stand in a one hour line either.
Anyhow, even though our virtual Cosmic boarding passes were expired already by 2 hours we waited another couple hours hours and went back later and we Walked on with zero minutes to the first preview. It as nothing more than the walk through the line lane.
I found this to be common. I have gone on Cosmic now more times than I can count at this point and if that line is long we just go back later in the day. They never told me once, "sorry you can not go on it is expired". We routinely wait until the virtual standby line at Cosmic is shorter. If the line is out the door at Cosmic we turn around and do other things. If you can not see the line coming out the door than you are golden to just go on in. We have gone to the virtual line as long as 10 hours after expiration and the CM's waive us in. Just screen shot the Virtual for Cosmic with the boarding number if you do this. I never needed to pull that out yet, but better not be sorry.