The U.S. Open is 90 minutes main time + 5 periods of 30 seconds byoyomi. It's...luxurious. I spend my extra time walking around and getting water and such, usually when I have a difficult situation that I need some space from. I did get some advice from Xuefin (Shirley) Lin 1p some time ago. She said with 90 minutes main time, spend 30 on the opening. So I do. At the 30 minute mark I check to see if we are near move 50.
After that, I probably defer from her advice because I dislike byoyomi...
In a 240 move game, if you have 60 minutes main time, that's 60 * 60 / 120 (your moves) = 30 seconds per move. This is assuming you want to finish in main time and don't consider byoyomi to be part of what you are given rather than an emergency allotment. (Cho Chikun and the like my think otherwise, but I'm not Cho Chikun.)
Now I know I can't really take 30 seconds per move. For example, I took 12 minutes on move 77 in game 2:
So because of this stuff, I pretty much blitz through most moves, even in the open. I don't know if that's optimal.
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was to erase white's potential through attacking (because I couldn't see a way to do it directly). So skipping that cap also represented a change in a viable plan.
makes more sense when white didn't play E2 (e.g. when white played G3 instead). That's because E7 aims for black to be able to play E2 - it's more efficient than if black stone were at E6.
, I want to continue attacking with F4. But I can see your apprehension about being cut. So maybe you can first play C8 crosscut, aiming to fix the cut in sente. Then you can play F4 with that sente. Since white ignored you, I want to punish him.