Can an ETG urine test detect how much alcohol has been consumed?

No. I've done my own "research" on this. I have UA on Monday, Wednesday and Friday. I typically drink every Friday and its never been an issue. I have read papers on this topic where other than a "high dose" group (did not say how much alcohol equaled a high dose), all people passed Etg test in urine at 24 hours. The high dose passed at 48 hours.

I decided to have some drinks after work on a Monday once and got carried away, ended up consuming 5 martinis, finished drinking around 10:30pm and still passed the Etg test on wed at 5am.

I think you have to drink the night before the test or consume ALOT of alcohol to test positive past 24 hours.