I requested a Paypal payout earlier and received the funds on my account within 10 minutes of submitting it. I believe it depends on your account history (how long you’ve had it, your reputation/ratings and if you are verified). Personally, I’ve been on Gameflip for over a year with perfect ratings, consistent sales and regular payouts so I am not a risk.
I heard that new accounts need to make a certain amount of sales and wait a specific amount of time before they can make a withdrawal. This is a security measure put in place due to the wave of fraudulent activity by new accounts on Gameflip.