you may want to do a range for block times.

We are under 10 minutes since 2009.  Maybe closer to 9 minutes then 10 minutes per block.

I suspect that  26 x 2016 = 52,416 blocks a year.

And we started in 2009 Jan 3

so Jan 3 2020 = 11 years


11 x 52,416 = 576576 should be were we where on Jan 3 2020  yet we were 611042 to 611200

that is 611200 - 576576 = 34624 after then 10 minutes

you could write it as

576576/611200 x 10 =  9.4335 minutes a block   for those 11 years.

you want more fun

611200 last block on jan 3 2020

623273 last block on mar 27 2020


that is 31 + 29 + 23 = 83 days x 144 = 11952 blocks would be every 10 minutes yet 12073  where made

so   11952/12073 x 10 = 9.89977 minutes per block  and price was 6940 jan 3 2020   and it is 6700 march 27.

So do yearly breakdowns

with efficiency
time per block almost always under 10 minutes

knock yourself out have fun with it.

Study flat difficulty periods and try to figure why  they happen.