This website offers 2 different payments options which depend on your login method.
If you sign in with bitcoin wallet address, your balance in Field Bitcoins will be paid to your Xapo Wallet on Saturday or Sunday each week. However, your balance must at least 25000 satoshi at the same time.
If you sign in with Email, then the earnings will be paid immediately to Xapo.
In my case, I sign in with wallet address and confirmed the email at the same time, so I cannot use that email address to login Field Bitcoins for the immediate payment. PLEASE PAY ATTENTION ON THIS unless you wanna fail like me. Sigh....