@Electro...
What notes are in the C Major Scale?
C, D, E, F, G, A, B, C right?
If you start on the note C String 5 Fret 3 and finish on the note C String 2 fret 1 you have gone one full octave of the scale:
C, D, E, F, G, A, B, C
But, within the span, or range, of playing the scale in that pattern (that is open strings and first three frets) there are other places where some of the C major scale notes can be found. They are:
String 6 open + frets 1 & 3 (E, F, G notes)
String 5 open + fret 2 (A, B notes)
String 2 fret 3 (D note)
String 1 open + frets 1 and 3 (E, F, G notes)
They all belong in the scale.
A scale has no predetermined length or start and finish point. A scale is simply comprised of its root and the total of seven notes within it. The root and notes can be at any pitch, whether very, very low (like on a double bass for example) or very, very high (like on a violin perhaps).
A scale is a continuum of repeating notes.
To train your ear to 'hear' that you are playing C major, it is sensible to start and finish on the note C, usually when practicing playing the scale pattern that would be the lowest available root note within reach of that pattern. But there is no rule saying stop at the next root going up, or going back down.
Look at this diagram. See how all the notes are in the scale?
