70.45 mm long
It is exactly 29.5 mm long.
A small version of a large graphic on a web page is often called a thumbnail. Many designers use them to put more on a single page and make it easier to browse.
According to Ripley's Believe it or not, the longest thumbnail ever recorded is a man's thumbnail, measured at 55 inches long. I do not have a citation, photo, or date on this as my tv doesn't tell me when episodes aired.
on of thumbnail in MS word
Thumbnail
Thumbnail crab was created in 1793.
3 mm is 0.3 centimetres.
240 mm is 0.24 metres.
650 mm = 25.59"
132 mm = 0.132 metres.
160 mm = 16 cm