Yeah man... I just dive a computer. Several of them.
I have a couple of little tricks that help me estimate what the computer is going to say along with enough experience to ballpark it. Including modified versions of the rule of 130 for planned decompression.
I've done dives with hours of deco. Many, many times. And some of the team clears sooner than me, sometimes I clear sooner than them.
I have a computer plumbed into my CCR that is monitoring my PO2 real time and an offboard one I just tell it I'm at 1.2 the whole time, sometimes they're off by a few minutes... but 5 minutes difference after 5 hours of deco doesn't bug me much.
A few minutes here and there. And any time I hear people get SUPER worked up about one or two minutes of deco... especially when that deco is less than, say 1/2 hour, or even no-deco limits, all I can think of is the 7 minute abs bit from Something About Mary.
I respect decompression theory and can give a better-than-average explanation of it at a theoretical level... but I admit I can't explain the actual math. Because it's pointless and contentious and constantly evolving. Because it's a working theory with various schools of thought, not established law.
I'm a dive instructor, not a mathematician, an algorithm programmer, or a physiologist.
But what I do know is that I've only ever been bent twice (both semi-deserved... one I started hiking gear back to the car as soon as I surfaced after over 6 hours of deco and got skin bends, the other I was doing long deco dives in frigid cold water for days and days... and had forgotten to back my computer off of my usual warm-water 45/85 to a little more conservative. My elbow hurt for a few hours. I breathed O2 and watched TV for an hour or so and skipped the next two days of diving.)
Other than that, following my looney dive planning that lacks any comprehension of anything neither I nor any of my hundreds of students have ever had a problem with DCS.
I take no issue that you wanna be a knowitall. I wanna be a billionaire. Neither of us is going to succeed.