Hi Wtfauoa,
What is the importance of the first 30 mins of market open ?
Why not say 60 mins or first 15mins ?
Why the first 30mins ?
I would say between 5 to 60 minutes from the market open time there will be mostly a signal, based on price action "against" time, which we call as momentum. In my experience the signal generated in this period is highly successful, may be because of the support from the third dimension, volume, which is generally more in the market open hour, plus the fourth dimension, fresh morning mind of the day trader.

Price momentum is two dimensional compared to time or price action which are single dimensions, and decisions based on the momentum may be more solid than just time or price action.
Higher the momentum (more price action in less time), greater must be the time frame for a safer and more successful bet.
https://www.elitetrader.com/et/threads/breakout-strategy-help.305641/page-2#post-4385322
From momentum trading perspective, apart from the early market open time, there can be signals anytime during the day trading.

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