If there time for proper prep between meetings ,most track get slick after 10-12 heats,they can’t really water as it will make it slippy on racing lines and the riders don’t want that.Seen enough speedway meetings go this way.Like I say 30 heats is not ideal .Not for me I’m afraid.Yesterday’s meeting was mainly juniors the majority can only ride slick tracks which was fine for them.Everyone to their own though.