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.
I am also not in favor of day trading since it is not profitable and hectic as well. This trading is all the time putting you in stress and indeed you cannot big profit with it until and unless you dont invest you much into it. Bitcoin is really very expensive coin to be used for this purpose, even if someone is interested din day trading, he or she should do it with altcoins because even if you go in loss with these coins, you can easily bear it.