On the R6, I close the LCD and run display performance in power saving mode. I may not be as demanding as others, but I find I can do just about everything I want through the EVF. This saves the battery and the camera never has to switch displays. I can go all day on a single battery with ~500 shots. I carry a spare but haven't changed yet during a shoot unless I started with a partial charge.
Closing the LCD saves the delay switching from the LCD to the EVF - it is always in EVF mode. This means just about anything I touch will turn the EVF on immediately - no delay. I can toggle the multicontroller with my thumb, tap the DOF preview button with my ring finger, tap the M-Fn button with my index finger, etc. and the EVF turns on immediately and is fully functional when it reaches my eye.
If I don't do anything, it's about 2 seconds from the time I start lifting the camera, less than a second after my eye reaches the EVF.