The reason why Calvin Harris named his album 96 months is because of the time span that the album 96 months covers.
Calvin Harris's compilation album, 96 months is named exactly for the time span that it covers.
The Calvin Harris album 96 months is a collection of his non album singles that was released over exactly 8 years, which is 96 months, which is said to be from the years 2015 to 2024 although that would be 9 years so that is also a bit confusing to myself.
Calvin Harris released his compilation album 96 Months on August 9, 2024.
The album serves as a sequel to his 2012 hit record 18 Months and features singles released between 2015 and 2024, including "One Kiss," "This Is What You Came For," and the lead track "Free".
It's likely just the way he wanted to name it even if it was longer than 96 months, but that is currently what all sources say.
But 2015 through 2024 is 9 years and not 8 years and would be longer than 96 months.
But even then 96 months is a good name for the album even if it was actually longer.