How to play a 2 octave scale?

Many guitar method books detail various ways in which to play a 2 octave scale.  For review purposes, 2 octaves means to play one complete scale from root to root and then the following register of the same scale...therefore, 2 octaves or 2 sets of 8 notes with the middle root serves as the last note for the first octave and the first for the second octave.

Therefore, how to play this 2 octave scale?  The 2 octave scale should be played in position.  Why? Well, there is no point in shifting much around positions if your focus is to "practice" the scale and get it in your ears.

Taking a major scale as an example, the following is an example...it is not a definitive...but what is definitive?  So here goes in a synthesized format that lets you see the string you are on, the frets you should be playing on that string, and the fingers to be used:

String - Frets - Finger
6            1,3,5   1,2,4
5            1,3,5   1,2,4
4            2,3,5   1,2,4
3            2,3,5   1,2,4
2               3,5     2,4
1            1,3,5   1,2,4

Keep playing!