I should set aside practice time dedicated to scales and every once in a blue moon I do. For the most part I spend about 5 minutes each time I pickup the guitar on scales. I only need to refresh my memory so I don't forget the 4 major/minor pentatonic and diatonic scales. Sometimes the 5 minutes turns into an hour or two LOL! I enjoy playing my scales and coming up with little original lead lines from playing around with them.
Most of my practice time is spent on arranging and developing new tunes and memorizing chords and lyrics. The scales come in very handy when trying to come up with some original leads for my tunes. Each of us must decide how we want to spend our practice time. For me, I just have fun with it. Scales play a very integral part, as do chords, in my guitar theory and history.