The other night i practiced Lydian, Ionian, Mixolydian, Dorian, Aeolian, Phrygian and Locrian scales for around 3 hours. I have learned the note positions and i got the scales smooth and quite tight.
Tonight i tried the same exercises again and my fingers tripped over themselves all the way through. My remedy for this was to put the bass down and make a cuppa then chillout.
As has been said above it's not a race. Set reasonable goals and reasonable time limits but don't beat yourself up if you miss a few deadlines.