In the long term, overtrading affects the bottom line a lot.
You have to look at your own pnl, and check:
a. What is the optimal limit for you on the number of trades in a day, in your last 6 months of trading?
For example, for me, my pnl just takes a big hit after the 3rd trade. If I take more than 3 trades in a day, it results in more losses over the long term. Infact, the pnl become negative. For you, this number may be different.
b. What are the trading hours in which you are profitable?
c. What is your most profitable setup?