A month had passed, and still he received no word.

Two months have passed and things will never be the same again.

Six months may pass before he can get around by himself.

A month passed away for ever before they found a new place.

Weeks or months may have passed since he last stopped by.

Who knows how many days or months have passed for him?

More than a month had passed since they were killed.

Weeks or even months may pass without a clear day.

I don't know how many months passed in this way.

By the time we travel back, three more months will have passed.