Can somebody help me correct these sentences?

[scott833]

1) How long after that if i fail to make payment on due date will i be subjected to late payment fee?
2) What is the length of time after the payment due date will i be subjected to late payment fee?
3) What is the time frame/time lenght for claiming the mileage after i boarded the flight?
4) How much time do i get to claim the mileage after i board the flight before i will no longer be able to do so.

[theeexcellence]

1) How long after that if i fail to make payment on due date will i be subjected to late payment fee?
2) What is the length of time after the payment due date will i be subjected to late payment fee?
3) What is the time frame/time lenght for claiming the mileage after i boarded the flight?
4) How much time do i get to claim the mileage after i board the flight before i will no longer be able to do so.

1) If I fail to make payment on due date, when will late payment fee be applicable to me?
Or
How long after I fail to make payment on due date shall I be subjected to late payment fee?
Or
How long after I fail to make payment on due date shall I have to pay late payment fee?

2) What is the length of time after the payment due date when I shall be subjected to late payment fee?

3) How long after I board the flight shall I be able to claim the mileage?

4) How much time do I get to claim the mileage after I board the flight before I will no longer be able to do so.

NOT A TEACHER