Each person own 1 Bitcoin and hold on to it for 20+ years.
Bitcoin is the best investment of all time. Owning Bitcoin is better than owning a house.
Sounds pretty long time frame to me especially considering the fact that the age of btc is already only 7 years - and even that has felt like forever.
However, holding 1-5 btc should not be impossible, and even larger amounts as long as you are having income from other sources and are not forced to sell at current levels.