@NanoRaptor Answering my own question now that I understand the topic a bit better: The closest number to what I had in mind is UBER, Uncorrectable Bit Error Rate and for most modern HDDs and SSD is somewhere between 10^-13 and 10^-16. In practice the actual Raw Bit Error Rate on operations can be as low as 1/1000, but SSDs use a bunch of Error Correction Codes to validate and fix data as they read it, so you end up with the UBER number.
As a fun extra. the question as posed is kinda invalid: SSD longevity, even under ideal circumstances is heavily reliant on the load of read/write operations, so basically the amount of ops translates to SSD age, unlike HDDs.
Refs used:
* Data Longevity and Compatibility
* Data Retention in MLC NAND Flash Memory: Characterization, Optimization, and Recovery
https://web.ece.ucsb.edu/~parhami/pubs_folder/parh19f-ebdt-data-longevity-compatib.pdf
https://users.ece.cmu.edu/~omutlu/pub/flash-memory-data-retention_hpca15.pdf
This and other things about SSDs here: https://www.alkoclick.space/things-i-learned-about-ssds