How long do scientists think fossil fuels will last for at present usage rates?

Different fossil fuels are expected to last differing times, for the most accessible (Gas and Oil) we have already passed peak production and will have virtually run out by 2050. For Coal the time frame is a bit longer 100 -200 years.

However, as we run out of oil and gas, our civilization may collapse and if this happens the coal reserves will be around for a bit longer.