Change Expiry date of MS office to hours quota then DD/MM/YYYY

Dear Microsoft customer care,

I just want to suggest, for expiry date of MS office can be changed from using expiry based on date to hours expiry of MS used. The reason why, like myself, access to MS office is not daily or event some of house's wife or retired person. They may used MS office very minimum less than 5hrs a day and when expiry date is near, they hv to purchase for another year. if and if, let say for $100 package can be used for 1700hrs, and once it reached the hours quota, then they hv to buy quota to keep using MS, i think is better. Expiry date MS office based on date is worth for professionals or students or others who really depends on MS office in their work or life,

Thanks for consideration.

Warm regards

Taufiq