I noticed . Higher girl will ask more money for same task.
Filming time is different because of total bonus. It can (should) be noted in normalized way. Like 20 000 000 hours / total bonus or something like that. That would be easyly compareable to your individual bonus. If it is higher you have less than an hour. If it is is smaller you have more than an hour. And if the number is longer or shorter, multiply by 10 for each digit. For example, filming time Indira8 is 158 years. That would be 1 383 675 hours / Total bonus and if you have a tb of 1m you can see quickly that it will take longer than an hour, but not by much. (Interesstingly, nowhere is it explained, why the tb reduces filming time. It explicitly states, money hearts and skills.
If the fake price is staying the same across resets for the same scene, I would leave the price. Mabye write a tier number instead of time. Boob Massage (T3), Shoulder Rub (T1) etc.
No clue about buildings. Maybe the bonus from a girl is different if the building was leveled by filming first. Or similar to fake timers, the first time you unlock a girls scene, the bonus is different.