I have well over a dozen units in various states of completion. In part because I often work on parts I understand well and defer parts I am still learning about.
But, I think you are not asking about units I am working on, but the civilopedia icons I did. Those are a seperate issue. Nearly all of those were done by request. Almost all of them had unit animations by someone else already done and were either missing the icons or the icon quality didn't quite match the animation quality.
So far, I have taken the time to get all the files for all my units. Including multiple animations, sounds, text, icons, and so on. I hope to continue this, but some sound files are hard to find or make. I did not include these things with the civilopedia icons because the original sound, text and animation files were works by others.
The civilopedia icons are not at all related to the units I am working on. Almost all of them involved convolutions (cutting, pasting, drawing and so on) with photoshop. My first two units were made this way. My more recent units, and all planned units, are all made with 3d rendering programs. You can achieve equal results with either method, but photoshopping units is VERY time consuming and many effects are very difficult to achieve with photoshop. I think my Jeep will stand as the finest work I could possibly do in Photoshop, but it is not quite as animated as my most recent hummer. The Jeep took me well over 100 hours (possibly more then twice that). The hummer took me less then 50... and only took this long because I remade it completely.
I have been just crushed at work for a few weeks, and I also had a major computer problem (neighbors tree got struck by lightning, and somehow my super-fancy UPS battery backed-up power system didn't completely protect my system.
Look for new work from me over the next month. Hopefully I will have the time to do all I want to.