One year is the worst case scenario. Drive with used up total bytes written rating, very hot environment, and unplugged. While SSDs are inferior for long term

One year is the worst case scenario. Drive with used up total bytes written rating, very hot environment, and unplugged. While SSDs are inferior for long term data persistence if it’s irreplaceable data you should be bring the file system online on a schedule and let it run checksums. If something errors restore from another copy. The magic of digital storage is perfect copies at low cost. The loss of any one copy is fine as long as it has been copied forward elsewhere.