So like 15-20 Years from now !
15 - 20 years are too long for waiting but it is too short if you don't pay attention on waiting time and just let time flies.However, a big challenge for you is secure your Bitcoin storage, wallets, backups and control your greed to take profit in next 4, 8 or 12 years. It is always easy to say "I am a hodler and will hodl my bitcoin" but when you see price rises like 50%, x2, x3, you will get rid of your plan and take profit.
Bitcoin will rise more but with less exponential growth rate than last 15 years since 2009 because we can logically think that with bigger and bigger market cap, with time, Bitcoin will have smaller and smaller growth rate in future.
How to back up a seed phrase?
