Managing Tasks requiring accomplishment with a defined Minimum and Maximum Usage window. Tasks that must be accomplished after but before a defined schedule parameter

Southwest Airlines would like to know how other operators manage Tasks that require accomplishment after a minimum usage but before a maximum usage.   Plan after but Before a specified scheduling parameter. 

example: 

Task must be accomplished after 10 flight cycles (FC) and before 25 flight cycles after initialization.  

Task must be accomplished 4 times and then terminate: 

1. Accomplished between 50-100 FC
2. Accomplished between 150-200 FC
3. Accomplished between 250-300 FC
4. Accomplished between 350-400 FC terminates 
5. Terminates after 4th accomplishment