Of course it's a good idea to day trading eth.You can earn handsome money by day trading. But in order to do that you should have a good Knowledge about day trading or you can loose money.
If you don't have a real job it becomes a great activity but if you have another job it will be difficult for you to divide your time. That's in my opinion.
split your time for what? day trading only takes time when we are satisfied with the results we get. market moments and determining assets are very important in day trading. we don't need to see the market for a whole day. I do daily trades in just 1-2 hours a day. but what we should know is not every day all coins have a moment for a proper day trading to make a profit.
If you have a large capital maybe 1 hour can produce big profits, but try people who start from small capital who expect big profits.