length

• n.長さ、長さ；時間の長さ；（音声の）音の長さ

longの名詞形から。

length

length: [OE] Length was coined in the prehistoric Germanic period from the adjective *langgaz (source of English long) and the abstract noun suffix *-ithō. The resultant *langgithō has subsequently diversified to Dutch lengte, Swedish l?ngd, Danish l?ngde, and English length. (German has plumped for the different noun derivative l?nge ‘length’, whose English relative lenge ‘length’ survived until the 17th century.)
=> long

length (n.)

Old English lengeu "length," from Proto-Germanic *langitho, noun of quality from *langgaz (root of Old English lang; see long (adj.)) + *-itho, abstract noun suffix (see -th (2)).

Cognate with Old Norse lengd, Old Frisian lengethe, Dutch lengte. Figurative sense of "the distance one goes, extremity to which something is carried" is from 1690s. Phrase at length "to full extent" is attested from c. 1500.

1. Strangely enough，you will automatically wake up after this length of time.

不思議なことに、しばらくすると自分で目が覚めることができます。

2.The length of the war is one of the biggest unknowns.

戦争がどのくらい続くかは最大の未知数の1つです。

3.They trekked from shop to shop in search of white knee- length socks.

彼らは足を引きずってある店から別の店まで歩き、膝をそろえた白い靴下を探した。

4.The guy just loves to yap，and will do so at length .

あいつはでたらめで、それを言うときりがない。

5.He struck a match，and held it at arm 's length .

彼はマッチを1本明るくして、腕を伸ばして持ち上げている。