Maximum? Hmm year 2050 and bitcoin is the only currency. Its a max win sitation. Bitcoin won, banks lost. Here is price prediction:
"| 2021 Edition. There is approximately US $37 trillion in circulation: this includes all the physical money and the money deposited in savings and checking accounts. Money in the form of investments, derivatives, and cryptocurrencies exceeds $1.2 quadrillion"
https://www.rankred.com/how-much-money-is-there-in-the-world/$1.2 quadrillion devided by 21 milion = 57 mln $ per bitcoin in present purchasing power. Consider 3% inflation per year and we have 138 mln $. Consider the fact that untill that day probably >50% of bitcoins will be lost forever and we have 276 mln $ per single bitcoin. Thats the answer to your question. "But my question is how much maximum a bitcoin can worth and when ??"
But is it probable? Most likely not. Is it possible? Well ... it is.
Good that the answer is qualified with "Maximum". Now that we have a figure about a hyperbitcoinization scenario where every other type of "money" is replaced by Bitcoin, how about a realistic one??
The current form of money is outdated and even the economists recognize that there is something wrong with the trend of ever increasing debt. The need for a new money is real. BIS playing with CBDCs is proof of this. Bitcoin can truly be a decentralized option to be the "people's money" with its own economy whose monetary policy is not controlled by any one country or by organizatons like IMF or BIS.
So realistically, what percentage of the "money market" share could bitcoin have?
100%? With fiat currencies, Gold and all the tanks and guns in picture, pretty much impossible.
50%? The top 1% own a much greater share than 50%. Highly unlikely.
10%? Inter-planetary corporations with Mars colonization and mining at the moon can result in a situation where this is likely.
So, based on your valuation of USD 276M for a 100% takeover, a 10% realistic takeover would put the value at around USD 27M, in about 50-80 years from now. Even a 1% share would mean 2.7 Million.
This isn't financial advice. Its an assessment based on the optimism that things eventually meander towards the most efficient and correct path. Bitcoin is just the right thing to do.