You 'need' as many as you can get. I understand it's attractive to set targets but the best strategy is to continually acquire and not focus too much on specific numbers.

However, if you like thought experiments, here's one. Let's say arbitrarily that approximately 4 million bitcoins have been irretrievably lost, and a projected world population of 9 billion people some time in the next 10-15 years, then there is on average 1,700,000 satoshis per person. I would suggest that people focus on getting their first 1,000,000 then beyond that simply keep on stacking.

Lol no number for me just gobble up as much as I can, the number is arbitrary just fun to collect more as I wait for it to monetise

A few million sats

According to this post: #51272

between 0.002625 and 0.00196875 would already be enough in a hyperbitcoinized world.

I will not stop stacking until I reach 2,100,000,000,000,000 satoshis

More will get lost over time

& there will be many who never own bitcoin

Best to keep stacking IMO