How many hours does it take to initially heat an outdoor in-ground pool in the off season months?

This is a question that can only be answered by many questions. How many gallons is your pool?,by off season do you mean say Alaska at 30 degree air temp and 35 degree water initial temp,or Arizona air temp 70 degrees water 60 degrees?. Is your pool covered or uncovered?,What is the btu of your heater?, What is your turnover rate?.and do you want to heat it to 75 degrees or 80 degrees or even 100 degrees? There are even more factors than this involved So here is a link to a heater site that will tell you the rise in water temperature for this paticular heater. Hope this helps. Kenny Kummer brody chemical