long finger

a little of something goes a long way

Only a small amount of something is usually required to produce a great effect.

a week is a long time in politics

In politics, much change can occur in a short space of time.

as the day is long

Unceasingly; very; thoroughly; to a very high degree.

come a long way

To make significant progress.

draw a long bow

To lie; to exaggerate.

draw the long bow

To exaggerate; to tell tall tales.

fat finger

A supposed cause of typographical errors, especially keyboard errors, caused from erroneous key presses or typing errors on touchscreen devices.

finger in the pie

A share in the doing of something; involvement.