Mine took about a day when I did the first install about 5 years ago. The line covers were the most time consuming part to make them look good. I used a level to keep them straight with each other.
This time (3rd install after a new dead compressor) took about 1/2 day. I bought new larger line covers. I tried using the old line covers but the new style copper covered line wouldn't fit in the 3" wide covers. The old lines were flexible braided lines and they were easily to install without linking the lines. The new style copper lines need a larger bend radius to keep from kinking the lines, so I went with 4" covers.
Since the mounting pad was already done previously, and the new line covers were there from the bad compressor install a couple of weeks ago it went easier this time.
I see I can get a 36k pioneer single zone for $2k from Amazon. I'm seriously considering it.