To avoid misconception because it seems you make a mistake. Do you mean you dont charge fees for token kept on exchange? If you dont charge less than 0.001Gold, is the fee only applied for working days or round the clock?
Below is the post already made by GOLD_official regarding the fee charged for tokens kept on exchanges.
According to the agreement with exchanges, where Digital Gold has made a listing, the 0.99% fee is not taken. Any user can keep tokens in his exchange account for years and not pay 0.99% for management.