rowuk's gonna be surprised. dr. feelgood is about to lose it.
you don't learn your scales to be done with them. you play scales and arpeggios every day of your life as a musician. they are the building blocks of every piece of music you'll ever play, and the building blocks of the technique of every instrument you'll ever learn. you never outgrow them, and you never stop playing them. michael brecker played them 8 hours a day. heiftetz practiced them 2 hours a day before breakfast. you not only play them in all keys, but in all styles, all dynamics, and all articulations. and if you don't have them memorized, it means you aren't playing them nearly enough.