On Sat, 9 May 2020 18:03:53 -0000 (UTC), "Yes"
wrote:

If they do, how long can they go without power before the data is lost?

No manufacturer will include a piece of paper with fine print that
says - 'don't store important data on our drive that isn't powered
from a computer, because it will all fall out, due to rot, at
precisely 42,389,467 hours.' Bit rot is theoretical. Like trade-show
laptops equipped with inexpensive SSDs units that, with a nudge and
wink, get reviewed for a life expectancy of a year.