The molecular clock runs into particular challenges at very short and very long timescales.

As a result, for shorter timescales the separation between energy levels is of no consequence.

From Bastion he discovered the difficulty of running a large deception on a short timescale.

These material types are rarely recovered due to the short timescales for planning and carrying out demolition work.

Others are likely to happen on a shorter timescale, but will probably not completely destroy civilization.

It was nothing that could be detected over any timescale shorter than a few million years.

This happens over a relatively short timescale and plant matter used as a fuel can be constantly replaced by planting for new growth.

Extinction debts incurred due to human actions have shorter timescales.

Radiation pressure from the star will push the dust particles away into interstellar space over a relatively short timescale.