The research paper, A Large-Scale Study of Flash Memory Failures in the Field, quotes " the number of times that a cell can be reliably programmed and erased before wearing out and failing dropped from 10,000 times for 50 nm cells to only 2,000 times for 20 nm cells" . This is a very good study on flash memory and SSD drives, with good info and references to previous research on flash memory as well.
If the data is mostly stored once and only read most of the time, the memory will last a lot longer than if the data is constantly overwritten and moved around. For Maidsafe farming where data will tend to be written once and reside for a long time. this could work well. For blockchains, it doesn’t work so well since they are pruned and rewritten frequently.