As I can see today recommended Gas Price SafeLow (Gwei): 35
https://ethgasstation.info/
When I put this gas price to ED
I see: Max Transaction Fee 0.008750 ETH (10.48 USD)
Will it be real fee? or only rare maximum case?
Anyway it's too much, and I'm getting warning message: "Insufficient balance for transaction"
That'll be because the gas limit of etherdelta is very big. You'll get max transaction fee from gas price x gas limit. I usually use ethgasstation to see if the recommended price is at what number. If they're above 50, i set the price at 12ish, and if below, around 30-50, I put 8, otherwise, 4.
It's still take few hours for me, though