2 examples of within hours in sentences

In sand the Ford cars have performed wonderful feats, but remarkable as was the record of that cheap American car with usit helped us very considerably to win the waryou could never tell within hours how long a journey would take off the wire roads.

When one tiny organism decides it is time for the reproductive cycle to begin, it triggers a mechanism through which hundreds of miles of coral reef can change colour within hours.

2 examples of  within hours  in sentences