There is no average about how many spins is needed for a single free spins so we cant say it is normal or not. What we can say is just lucky or unlucky. Some time a game may give few free spins within 100spins but at the other time, the same game may not give you a single free spins within few hundreds spins. My worst experience with Pragmatic play was when I did not hit free spins after 500 spins and 300 spins with double chance on the same game but not at the same time. In fact it is the game that gave me max win 4-5 times within a week few years ago.