In short the answer is Yes! Winnings earned during free spins can be withdrawn instantly as there is no wagering requirement attached.
New players are often shocked when they are denied their winnings earned from free spins. This is due to the wagering requirement which more often than not makes free spins a burden more than a reward. Fortunately casinos have began offering no wager free spins where you can withdraw what you have won during free spins at any time! This is something which is praised among the gambling community as it displays transparency and openness from the side of the casino. If you see a casino that offers no wager free spins you will know that the casino is a cut above the rest when it comes to giving back to their loyal customers.