Quote from seleukos:
We are very comfortable trading a part of the day, to diminish risks.
I.e.: we are trading SP future from 10:10 am to 3:45 pm (New York time)
In this way, we avoid strong and random movements in the first and last part of the session.
Moreover, we use candles referring to this period. Stop loss can be very tight and we are stopped (if so) randomly on the trading session.
Covering the whole session instead, stop loss should be larger and nevertheless you can be often stopped in first minutes.
Moreover, if gaining, the last half an hour often retraces and eats you provisional gain.
We have assumed control