Write a Python program that calculates the estimated flight duration in minutes for an autonomous mapping drone based on the survey area in hectares.

Your program should:

• Keep asking the user to enter a survey area in hectares until they enter a value that is between 1.5 and 7.5 (inclusive).
• Calculate the base flight duration in minutes by multiplying the survey area by 12.
• Ask the user if high-resolution mode is active (expecting the user to enter 'yes' if it is).
• If high-resolution mode is active, multiply the base flight duration by 1.5.
• Output the final calculated flight duration in minutes.

You should use meaningful variable names, correct syntax, and indentation in your answer.