Estimating this is quite difficult. Personally, I do not wish to rely solely on Bitcoin during retirement. I plan to own other investments, such as real estate and other tangible assets, alongside my Bitcoin holdings. With this approach, I believe I can live comfortably with 5 BTC since I won’t be depending on Bitcoin alone. This would also give my BTC the opportunity to appreciate and provide good returns. I can't imagine depending on just BTC which I'll have to withdraw at intervals to pay my bills.

I think this is just the best way to go about it since we can't really predict the future to know what it holds for us. Putting all our eggs in one basket (I.e relying on btc alone) might really be a risky decision to make.

Regardless of the quantity, as long as it can established a good and stable business, then good.

Without a proper cycle and good management, even how much Bitcoin we have to support our retirement, it will soon deplete.

In retirement period, it doesn't mean a full relax. Expect many expenses (like medicines, sudden health problems) to the point that we are forced to sell our crypto assets. That's why it's better to make something good out of it so money will continue to flow even at retirement period.

I don't know how to calculate the benchmark of how much btc for retirement because certainly for now I still think that as long as I am still able to collect bitcoin for my future, then I will do that. I don't care how much the benchmark should be set because for me if the benchmark is too small then in the end it will only limit ourselves to collect bitcoin and if the benchmark is too big then it will only burden ourselves with the investment made.

I'm just focusing on collecting regardless of how much it is, it's the maximum I can collect so I don't want to set a benchmark or anything for my future or retirement because I don't think I need to do that right now.
Whatever the amount is, as long as we can afford it then that's ultimately what we should be proud of as bitcoin holders.

It varies. Bitcoin is highly volatile, so we can’t have full assurance that its value will keep on surging high when retirement age comes. If that’s the case, I wish to have 50 bitcoins if that would be highly possible. My point is, even if its price would fluctuate from time to time, I wouldn’t be totally bothered on it. I think the key here, don’t just focus on bitcoin, learn to acquire other potential assets as well outside cryptocurrency.

Depends on where you live, how you live and with whom you live.

Is 10 BTC enough to retire in Switzerland, with a family that depends on you? No, it is not. You might live a comfortable life for a decade or two but 1 million will not last forever. However if the talk is about say... Thailand, then obviously 10 BTC is going to bring you a really nice retirement.

I like your wishes, OP; I think we would all gladly accept so many bitcoins that in retirement, as many say, "start living for real.". But seriously, today's life in my country is quite expensive, and if we talk about the age of retirement, the prospects that one day everything will change, one should not expect. Therefore, you are right; the more we can put in our safety cushions for the future, the wiser we will look among our peers and independent of our children. In my country, it is customary for children to take responsibility for the maintenance of elderly parents, but I see how much care confuses my parents; I would prefer not to be in their position. I voted for 10, and I hope that one day my thoughts will materialize .

I reckon by the time I retire even 1 BTC would be enough, let alone 10. Granted I still took 10 . I read somewhere that if you wanted to retire, you'd want at the minimum 25x of what your annual income is. And I reckon that's just the minimum! Granted I'd probably have a lot more success if I calculated what my monthly average costs were and calculated from there.

Personally think it's not. BTC seems like it's only going to appreciate after all and with where I am right now, don't really see me buying 10 BTC. I mean I probably can at some point, but that'd require me selling almost everything I would've bought and earned (in the future that is), and we all know that's a pretty bad idea.

Developed countries with large incomes or quite expensive living costs certainly require a lot of money to be able to make a pretty calm pension.
I also say that this depends on how the condition of each person, because everyone also has different needs.

If in Switzerland 10BT is still very minimal, then in Indonesia where I live it becomes a very safe pension fund,
that 1BTC is also quite safe for decades, with a note that no luxury items are bought, only for the necessities of life.

I live in a country where most people don't know about Bitcoin. Investing in Bitcoin is considered illegal in my country. If I had saved the amount of money I have earned so far in Bitcoin, I would definitely have more than 2 Bitcoins. I spent the amount of money I earned immediately, so I don't have any Bitcoin holdings as of yet.

If I imagine, of course I want to have a lot of bitcoins for my old age. But I am also realistic, bitcoin is very expensive for me right now, even to get 1 bitcoin is very difficult, I do dca every period but I am not sure I can save it in the next 20 years. Because I don't know my economic or financial condition in the future and of course I invest in bitcoin, there must be a target, especially every four years we will experience bitcoin halving and of course here there will be very great market dynamics before and after halving. But even so, I will still make bitcoin a future asset, although when the target is reached, I will not sell it all, there must be something I hold.

If in the future my finances start to improve, maybe my strategy will change. But for me right now, I am just being realistic, not forcing my financial situation too much. However, I still hope and try that in the next 10 years I will have 5 or more bitcoins because with the development of bitcoin as it is now and many countries are trying to adopt bitcoin, of course bitcoin assets in the future will be a rare asset so the more we hold bitcoin the better.