Day trading gives out smaller profits and hence it requires a larger amount to get a substantial amount of profit in day trading.
It is also quite risky to day trade since the volatility is high in crypto. You can start day trading from 0.5 to 1 BTC but then be careful in your trades and never sell in a loss.
For a beginner or for anyone at all, I would not even classify day trading as the best option. So many people have lost a lot trying to day trade and except you are willing to go ahead despite the risk, it is a strange way to trade. There are some level of trading you can make huge money from which to me is much more preferable than trying to day trade.
depending on how much you are targeting, the amount depends on you, if the amount of profit may also be great if the profit is with you, and vice versa.
Yes, the amount depends on each individual. Your pocket and your knowledge is what determine. If you want to earn big, you have to trade big, and then you have to be sure you are knowledgeable enough to always pull of good trades so you do not end up regretting it in the long run. Trading requires strategy and for those who do not have one, it is best to just stay away.