To answer this question, I would need to know more information about the candle, such as its initial height and burn rate.
The burn rate of a candle can depend on various factors, such as the type of wax, the size of the wick, and the environmental conditions (e.g., temperature, humidity, air flow). Additionally, candles can burn at different rates depending on whether they are burned continuously or in intervals.
Without this information, I cannot accurately estimate how many hours it would take for a candle to burn down to a height of 1.3 inches.