How to use "period" in a sentence

During that period fifteen different and greatly distinguished citizens have, in succession, administered the executive branch of the government

To those people in the huts and villages across the globe struggling to break the bonds of mass misery, we pledge our best efforts to help them, help themselves, for whatever period is required - not because the communists may be doing it, not because we seek their votes, but because it is right.

Tina realized that she had been wrong to think that celibacy should be a part of her period of mourning

That's an incredibly short incubation period

My narrative ends here, at the end of the happiest period in my life.

The only thing that had not improved was her memory of the period between her departure from Blackwater Park and her escape from the asylum