'a proper length' is correct and usable in written English.
You can use it when you want to indicate that something (an object, an event, a task, etc.) has an adequate or sufficient duration or size. For example, "We took a short break, but ensured it was of a proper length not to disrupt our concentration."
Here they banged the ball into the pitch using a strategy as old as Corporal Jones' observation that "they don't like it up 'em", while the Sri Lankans shrewdly bowled a proper length for more of the time – except when Root, who appears to irritate visiting cricketers more than most, was on strike and to great effect against Anderson with the last ball of the match.
Let G be a discrete group with a proper length function l.
To determine a proper length of an MCLT frame, the reverberation time of the channel should be considered.
Therefore, setting the window to a proper length is important to balance the performance between the speech detection accuracy and the FAR. Figure 1 MO-LLR scores (SNR = 15 dB).
After general anesthesia, a segment of the descending colon was exposed after a lower midline incision and was wrapped with a nonabsorbable synthetic mesh (Prolene Mesh, Ethicon, Inc., Somerville, NJ, USA) of a proper length.
First you want to cut your wicks to a proper length.
This would follow because, even in flat spacetime, there are timelike paths with unbounded acceleration which have only a finite proper length (proper time, in this case) and are also inextendible.
If the fibre refractive index is n and c is the speed of light in vacuum, the proper time spent by a photon in a fibre loop of proper length l is (nl/c).
Compare the new cable to the old one to be sure you have a cable in the proper length.
Both the prosecution and the defense informed the jury that the Satmar Hasidic community, to which Mr. Weberman and the girl belonged, was so rigid that questions from a young girl about something as simple as the proper length of a skirt could lead to mandatory counseling, and even expulsion from school.
We get vivid, subjective glimpses into his mind-set, feeling his unease as he walks down a street, his struggle in a diner to gauge the proper length of time for, say, glancing at someone.
