It is not that long. Actually other currency or commodities have a longer waiting time before it change its price. Bitcoin is a lot fastee when it comes to fluctuating price.
in order to become a day trader you should first learn how to trade and how to read the market so you can predict the movement before it happens so that you can make that profit. otherwise you will lose more money.
also you have to accept the risks, and the stress that this job will bring to you.
Stress is a part of any job that you do, but with bitcoins you always have an opportunity to earn more money if you have talent and skills which is not possible with any other job.