First, you need to answer: when do you want to become a Bitcoin millionaire?
If it is in a year or so, you will surely need a few tens of it. However, as time passes, if the price of Bitcoin continues to rise, you will need much less than that.
It will take long time, more effort, and hardwork to become a millionaire. You have to be wise when it comes on budgeting of money because you spend also from it. I do not need a lot of money being save. 1 btc is enough to place in wallet because it will grow more in the future as well. I am looking to have a simple life having comfortable home and financial freedom.