In terms of your first $100k insured in US bank via FDIC (above that you have to have personal insurance which is very expensive), it might take even 15 years to recover your funds, depending on complexity of claims and number of different instruments that bank has offered to its clients.
For example, there are still open and active claims in case of NextBank that has been shut down in 2002, and had some updates on status done in early 2015, some 13 years later [1]
Personally I suggest keeping 70% of your financial assets in cash in safe at home, preferably split into 20% in low-volume silver coins (80% silver) and 20% in foreign currency (EUR) and the rest in USD.
Seriously? You'd suggest one keeps 70% of their liquid asset in _cash_ at home?
Yes, if you're living during the Great Depression perhaps but your suggest is ludicrous. Maybe a few percentage points in crypto and cash, but most of it should be in your bank/investment accounts.
Bank and investment accounts will yeld you single-digit points per year and in most cases - unless you have few MM, the cost of your bank account will be more than what you earn.
Meanwhile banks wage war on cash. Its harder and harder to withdraw your own money. Here, try and show up at your bank say you need $150,000. They tell you to come back in few days, and in some cases they will ask you to fill out the form and explain yourself why you want to withdraw your own money.
If you do not live in a reasonably safe neighborhood, plus do not owe an alarm system, plus do not owe a safe, plus do not awe a firearm, then yes the bank is your best friend. Other than that no reason to keep some federal paper at someone's else possession at their disposal for a mere 0.5% per year. You don't gain anything and in some cases, you might lose some or all of it (yes extreme scenarios but always)
ps. in all fairness I would say keep 70% in gold or silver, but over the years this commodity has been shifted between the countries in such huge quantity (government buy/sell-outs), that the price is dictate by which country has specific political system and how much PM they owe, rather than true market price. Unless you can predict you won't need to turn your PM into cash within next 5-10 years, which is hard calculation for anyone these days.
FDIC is now $250K PER bank. You just have multiple accounts across a few banks until your wealth is so much that that becomes unmanageable and then you just hand it over to the Berkshire Hathaways of the world.
Tesco is licensed in the UK, and so is covered by FSCS [1] (similar to US FDIC) up to £75k.
It's not so relevant here, but in the case that the bank became insolvent (very unlikely in this case), FSCS aims to pay out within 7 days, and will pay all claims within 20 days.
For example, there are still open and active claims in case of NextBank that has been shut down in 2002, and had some updates on status done in early 2015, some 13 years later [1]
Personally I suggest keeping 70% of your financial assets in cash in safe at home, preferably split into 20% in low-volume silver coins (80% silver) and 20% in foreign currency (EUR) and the rest in USD.
[1] https://www.fdic.gov/bank/individual/failed/banklist.html