I drank 3 beers last night now I have to take a EtG test the next day within 24 hours will I fail?

Depends on the timing. Is the testing Court ordered or for employment?

Depends on the timing. Is the testing Court ordered or for employment?

Court ordered. I had three beers around 9pm I have to take a test at 6pm today

Yeah, with that time frame, you're probably going to fail.

How long do you think it will take to leave my system? I am very active in the gym and I drink plenty of water as it is.

No way to tell... 60 hours or more probably.

If your urine tests diluted it's an automatic failure.