The more I think about this, the more I keep coming back to one thing - it actually doesn't matter much what route you take just so long as you keep going.
Ask 20 guitarists what precise order they learned in, and how they went about studying and practice, and you'll get 20 different answers.
But ask 20 people who gave up playing why they stopped and mostly you'll find that it was for the same reason - their motivation to keep going just dried up.
So I have no rules or timetables about what I must do each day, or for how long. I have only one rule - keep playing, and keep enjoying it. And if that means 5 hours of improvising for every 1 hour of more rigidly structured work, then so be it. My ears tell me it's working. And that's all that matters to me.
Cheers,
Chris