

Very, a shot at the same ratio for different lengths can taste super difference. The amount of time the water is in contact with the grounds effects the extraction. However, there is no set optimal time, and 25-30 seconds is just a general guideline. I usually prefer my espressos pulled in under 20 seconds.
You’re looking at this with a very closed mind. This isnt (currently) being designed for people to just do normal computer stuff but in their brain. This technology has huge potential for improving prosthetics and treating neurological disorders.