To get to the count, I started by tracking the comics I've gotten this year and the comics I've read this year. That provided me a list to work with and I've just checked it against the two short boxes full of comics so I'm reasonably confident it is accurate. I'm not concerns with tracking when I read the comics I've read. Moving forward, the count of comics read might be accurate on a day by day basis or it might not be. It depends if I have the time to keep track of my reading or not.
The chart below shows the influx of new comics each week (in gray), the number of those comics that I've read (in green) and the accumulation of unread comics (in red).

As you can see, I started having a few items accumulate each week starting in March. Some stuff happened in April and May which required some of my time and more stuff in June resulting in one of the largest backlogs I've had in years. Typically I only get this far behind when I'm traveling but the last few months have been unusual.
The problem isn't too many comics to read but a matter of having virtually no time to read any comics. Note the green line going from 45 to 65 comics read a week to only a handful each week.
Hopefully my life will settle down after Comic-Con giving me a change to do a deep dive into my growing stack of comics and catch up on my reading.
Comic-Con is nearly here which usually leads to a three week build up of comics to read. My next batch of comics has at least 50 items in it. I'm not sure how big the other weeks in July will be.