figures

72.6474 trillion gallons of oil
2320 trillion pounds of coal

33,438 kcal per gallon of crude oil
3,175 kcal per pound of coal

352,600,000,000,000 metric tons of body mass for PBSO
777,349,012,000,000,000 pounds of body mass for PBSO

Roughly 13 calories per pound per day for human metabolism

       10,105,537,156,000,000,000 calories per day for PBSO at human metabolic levels

2,429,183,761,200,000,000,000,000 calories of crude oil

    7,366,000,000,000,000,000,000 calories of coal

At human metabolic rate the PBSO should consume the combined caloric value of known coal and crude oil deposits in 243654.97612 days or roughly 667.5 years.