I have few USB flash drives which have 'died'. Is there any estimation how long those current hardware wallets on the market, for example trezor or ledger nano, will last?
it depend on how many data you write and read with that usb stick, but if you are going to put only the wallet.dat there it's not much and should not cause major break anytime soon, it will last many years, i would suggest to buy many of these usb stick they are cheap and save your ass if one is broken