Why does it take so long to fund Coinbase account?

[uzair]

I did an ACH transfer to fund my Coinbase account for the first time with $1000. It took 8 days to go through. In that time Ethereum went up by 40% so I lost out on $400 gain because Coinbase is incredibly slow. Coinbase debit and took the money out of my bank account immediately on the same day I started the transfer but it takes 8 days to see the funds appear in my Coinbase account. And that's only after I filed a complaint with my bank and they contacted Coinbase on my behalf. My bank told me ACH transfer should not take that long its usually only 1 or 2 days at most.

The bank I use is in California the same state as Coinbase so it should not take that long. I could understand taking longer if I was in a different country but that is not the case. Whenever I do ACH transfer to fund my stock market brokerage account for investing in stocks the funds always show up immediately within 24 hours so I don't understand why Coinbase is so slow. Makes me wonder if they are a scam.