I compare practicing to dieting. One approach is practice whenever you can, as long as you can, as often as you can. Just like how some people will eat 5 small meals a day to boost their metabolism.
But in my experience, both in music and dieting, I see a complete different approach that has also given me huge results. In dieting, there instead of eating little meals often, you eat one huge meal a day, either when you really feel hungry or on a schedule like only breakfast or dinner. This is called intermittent fasting or IM. In my practice, I have noticed where I would train hard for a period of time, say a week or three months. Then the next week or three months, just stop and get away from the guitar. Whenever I come back to practicing, though I may be a little rusty the first hour or two, but I usually pick up easy from where I left off. To add, I feel a new gush of inspiration, either to learn or create. I can only speculate why this works for me in my music practice, but this approach fits my current lifestyle and I almost don't have an option. I can't practice very regularly for a year or two straight.