None of my comics have been published anywhere yet, but my traditionally made comic which is about 135 pages long as of now took me about 2.5 hours to read (though I think it would take the average reader closer to 1.5 hours as I tend to look at panels for a longer time).
There are around 7 panels on each page. I started working on it a year and a half ago and I put it on hold for some time so I could work on another, this time digitally made series.
As for the other series, it's currently 32 pages long (I started drawing it on the 4th of March) with an average of four panels per page. It takes me around 20 minutes to read through everything so far.