What determines Ranald's blessing?

What determines Ranald's blessing? - Determined smiling businessman with laptop on street

Ranald's blessing seemingly gives random amounts of progress towards loot boxes. What determines how much progress you get? Or is it purely RNG?

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What determines Ranald's blessing? - Man in Black Jacket Driving Car

What determines Ranald's blessing? - Free stock photo of 911, accident, administration

What determines Ranald's blessing? - Cheerful senior businessman shaking hands with partner on street

Ranald Slidell Mackenzie - America's Greatest Indian Fighter (6/17)

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Images: Andrea Piacquadio, Kindel Media, Kindel Media, Andrea Piacquadio