Order of fuel usage? (glycogen vs. gluconeogenesis)

[hyrule]

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I was always under the impression that glycogen stores were depleted within a couple of minutes of exercising such as weight lifting, for ex.

However, during starvation, glycogen provides fuel from days 1-3 according to First Aid. From then on, gluconeogenesis takes over.

Can anyone explain how when glycogen breakdown stops and switches over to gluconeogenesis? Does it depend on the situation?

 

[cbrons]

Rate of glycogen depletion during exercise is dependent on duration and intensity. Low to moderate intensity exercise depletes primarily fat and spares glycogen. High intensity exercise rapidly depletes glycogen stores