I agree the first hour or two generally provides some of the "better" trading opportunities. There is even a term for it... the golden hour.
That said, I 100% agree with BlackBison. It is a mistake to trade solely on this type of characteristic. As anyone who has traded a while knows, these type of "perceived" characteristics have a way of proving themselves inaccurate, especially when it involves YOUR trading.
My suggestion, again the same as BlackBison, is to trade whenever the proper opportunity presents itself throughout the day. But further enhance this by using a trade journal, for each and every trade, winner or loser.
If properly journaled, you will be able to pinpoint days/times that are most applicable to YOU. For instance, I know for myself, the golden hour on Mondays, and even more precisely, days following holidays, as will be the case next Tuesday, are not the same FOR ME, as the golden hour on other trading days. I also know, FOR ME, the last hour of the trading is far more "dangerous" than a lunch time slowdown. This represents only a few of the pieces that can be culled from a complete and disciplined use of a trade journal. Include your setups and reasoning, and eventually you'll learn whether making trades in the first 10 minutes of rth is counter-productive FOR YOU, or not

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Good trades to all.
Osorico