It makes and obtuse right triangle.

For each time period, each time "t" increases by one, the population will be multiplied by 4.
Well x is an obtuse angle
but the angle e,f,g is an acute angle
See the attached, the line going vertically is at -0.7.
We'd have to simply divide the total amount of hours by the total amount of episodes. This would be 10.5 / 14 = 0.75
So now, let's check if this is correct by multiplying 0.75 * 14 which should give us 10.5.
So the answer would be: 0.75 hours per episode.